since u didnt state the price, i also recommend jagoya XD
if want cheaper, go saisaki at wisma UOA II or shogun at 1U.. else try Shin-Ichi at wasma antarabangsa! there got infinite fresh oyster/cooked/ or even cheese dressing haha

Wisma Antarabangsa at Jalan Bukit Bintang..
-the best thing bout Shin-Ichi is unlimited supply for oyster (Saisaki give 1 per head, Ichiban need to snatch with other)..
-not much people aware of that place, so take ur time choosing ur food without pushing n hushing XD
-got herbal soup like 'mini buddha jump over the wall', 'ginseng' etc
-the cake there are nice
-the only let down for me is the konyaku jeli hard to take.. always break coz no proper plate to support XD
-the variety is not much if compared with saisaki but almost all that u expect in Japanese buffet is available such as tempura prawn (aLOT!!), teppenyaki, sushi, unagi, n alot more.. got chinese food corner as well..
-price is is +- RM48 per person.. Saisaki +-RM55 per person
*please note that my price is rough nett price, not those ++ thingy XD

Ichiban - SUXX! I rather go Sushi King then

Jogoya - Nice environment, very expensive, lots of varieties, opened by Taiwan company I think (not sure), but the food so-so only

Shogun - dunno. How much per person?

Seisaki - heard before but tak tahu mana

Oishi - last time ate before at Boulevard Mid Valley, but it's not there already izzit

Genji - always very full..dunno why. But the food quality not bad, it's almost all Jap food unlike Jogoya apa pun ada

Kampachi - always so packed..dunno why again. Food so-so only, sometimes saw some food never see before..dunno what

Keyaki - I like this place, quiet and can eat in peace dun need to rebut with other people. But it's best to make reservations first. They have the best fresh oysters there, can it's mostly all pure Jap food, and cheaper than Jogoya

Seki-Tei - Not bad, ate there few times, mostly all Jap food as well. But the environment dunno why..I don't really like it, maybe it's too dark