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EDITED : since mission already accomplish...I'd change this thread to a good reference for nice dinners around KL...I know a lot of guys are planning to have dinner with their love ones and find it difficult to decide...so, I just compile and summarize people's suggestion here for your reference....will update with list of restaurants soon..just doing my bit for the LYN community 

->san francisco steakhouse... subang summit

->spicy kitchen in ampang with romantic enviroment n band of singers...moved to Federal hotel

->Starhill
No. LG 16, Starhill Gallery, Jln Bukit Bintang,Lebanez, Middle Eastern cousine.http://www.tarbush.com.my

->victoria station!!!!

->KLCC's Aseana Cafe.

->The Ship at Pertama Complex ,can ask for candle light dinner.
->Corus hotel near KLCC or Ampang Park(got pianist)

->naili's place at sentul

->Top 10 Most Romantic Restaurants : http://www.floralembrace.com/forum.php?board=8.0
1. Bon Ton, Changkat Raja Chulan    -> Western/Fusion
2. Tamarind Hills, Jalan Kerja Ayer Lama, Ampang -> Vietnamese/Thai
3. Cilantro's, Jalan Tun Razak  ->  Western/Fusion
4. Rahsia,  Jalan Damai  -> Western/Fusion
5. Villa Danieli, Sheraton Imperial  ->  Italian
6. Le Bouchon, Changkat Raja Chulan ->  French
7. Mango Tree, Lorong Ma'arof, Bangsar  -> Italian
8. Opus, Jalan Bangkung, Bangsar  -> Italian
9. Tamarind Springs, Taman TAR, Ampang  -> Vietnamese/Thai
10. Delicious by Ms Read, Bangsar Village  -> Fusion

->Marche, The Curve...ala Carte..quite noisy place...

->tgi fridays

->chillis

->Star Hill's lower ground floor

->'Bombay Palace' in KL

-> Zen at Sunway Pyramid, on top on Kim Gary

->PLace Sri CARCOSa

->Federal Hotel Revolving Restaurant - RM128++ per person

->Villa Danielli (Sheraton Imperial Kuala Lumpur) - RM350 per couple

->Chatz Brasserie (Grand Plaza ParkRoyal Kuala Lumpur) - RM210 per couple

->Seki Tei (Holiday Villa Subang) - RM168 per couple

->Dorsett Regency Hotel - RM288 per couple

->et's cafe in rawang.....inside the restaurant is fully decoration by the aquarium
8.30pm-10pm got band performing

->Chakri White House near Thai Club

BUNGALOWS

-> http://www.bontonkl.com/html/home.htm  <-received a lot of good reviews from LYNetters

-> http://www.top-hat-restaurants.com/

INDONESIAN FOOD

->Bumbu Bali in puchong,location is at taman puteri, opposite Giant Supermarket.

->House of Sundanese Food at level 4 of KLCC : http://www.friedchillies.com/review.php?id=139

-> Okra (One-Utama) Kuisine that is serving Indonesian food

ALL YOU CAN EAT
-> SteamBoat -Seoul Garden@ Pantai Bharu KL[U]
Lunch - RM25.88++
Dinner - RM35.88++
comments : pilotHans - ive personally dine here during ramadhan buffet in 2008.
contact : Plaza Pantai (Kerinchi LRT Station), Lot C1, 27 and D1, 26, Ground Floor
Tel: 03 - 2283 1888, 012 - 609 7385
->

+ PIANO
->melia hotel
->mandarin oriental but the piano is located on the stairs in front of main lobby...
->

p/s will update for you guys from time to time......sorry if it's a bit of messy

List of Fine Dinning restaurants from another merged thread - compile dby stimix:

Frangipani
25 Cangkat Bukit Bintang, 50200 Kuala Lumpur
Tel: (603) - 2144 3001

Chalet
Hotel Equatorial, Jalan Sultan Ismail, 50250 Kuala Lumpur
Tel: (603) - 2162 7777

Rossini
The Ritz-Carlton Kuala Lumpur, 168 Jalan Imbi 55100 Kuala Lumpur
Tel: (603) - 2142 8000

Pacifica Grill
Mandarin Oriental Kuala Lumpur, KLCC, 50088 Kuala Lumpur
Tel: (603) - 2380 8888

Third Floor
Level 3, JW Marriott Hotel, Jalan Bukit Bintang
Tel: (603) - 2715 9000

Cochine
64 Jalan Doraisamy, Asian Heritage Row
Tel: (603) - 2697 1180

Passion Damansara Heights
13 Jalan Gelenggang, 50490 Kuala Lumpur
Tel: (603) - 2093 1923
(Min 15 persons required - Private Functions ONLY)

Le Bouchon
14-16, Cangkat Bukit Bintang 55200 Kuala Lumpur
Tel: (603) - 2142 7633

Scalini's La Picolla Italia
19, Jalan Sultan Ismail, Kuala Lumpur
Tel: (603) - 2145 3211

Le Bernardin
38 Cangkat Bukit Binatng, Kuala Lumpur
Tel: (603) - 2142 1755

Fic's Restaurant & Bar (French)
Lobby Level, Mutiara Kuala Lumpur, Jalan Sultan Ismail, Kuala Lumpur
Tel: (603) - 2124 2322 ext- 3816/3817

Lafite (French)
Lobby level, Shangri-La Hotel Kuala Lumpur, 11 Jalan Sultan Ismail, Kuala Lumpur
Tel: (603) - 2074 3900

Cilantro Restaurant & Wine Bar (French)
Micasa Kuala Lumpur, 368B Jalan Tun Razak, Kuala Lumpur
Tel: (603) - 2179 8000 ext-101

Villa Danieli (Italian)
Sheraton Imperial, Jalan Sultan Ismail, Kuala Lumpur
Tel: (603) - 2717 9922

Opus Bistro
67, Jalan Bangkung, Bukit Bandaraya, Bangsar, Kuala Lumpur.
Tel:03-20924288

21 Kitchen & Bar
20-1, Changkat Bukit Bintang, Kuala Lumpur.
Tel: 03 2142 0021

Cafe Cafe
175, Jalan Maharajalela, 50150 Kuala Lumpur.
Tel: 03-21458141

Dubrovnik
J-0G-14, Solaris Mont Kiara, No.2, Jalan Solaris, Mont Kiara
Tel: 03/62036780

El Cerdo
43 & 45, Changkat Bukit Bintang, 50200 Kuala Lumpur.
Tel: 03-2145 0511

Max! Kitchen
27 Tengkat Tong Shin, Kuala Lumpur.
Tel: 03 - 2141 8115

Vincenzo Ristorante Italiano
One Bangsar, 63H Jalan Ara, Bangsar Baru, 59100 Kuala Lumpur.
Tel: 03-22871686.
Non Western Restaurants:

Malay Cuisine
- Enak KL Starhill
- Bijan Jln Ceylon (I like this restaurant very much but I dunno whether can be on fine dining or not)
- Ibunda (Too expensive but worth a try especially their ambience and creativity)

Indian
- Bombay Palace (I like the decor and serves great north indian)
- Bangles Restaurant
- Saffron (Food was okay but the restaurant always empty)
- Vansh (I like the food here and worth the money)

Recommended None Western chinese Fine Dining:

1) Loon Sing - Nilai N2 49.627 E101 48.435 (Non halal)
2) Oversea Restaurant - Recommended - Armada, & Ipoh (Non Halal)
3) Toh yuen @ pj hilton
4) mandarin palace @ Mandarin Oriental
5) shang palace @ shangri la kl but is old and quite run down
6) the emperor @ grand dorsett kuala lumpur (ex subang sheraton)
7) chynna @ hilton central kuala lumpur
8) oriental pavilion @ jaya 33

romantic.
why not romantic?