Best at the moment:
Y470, i7-2630QM + Nvidia GT550M@RM2999[JBL]

Or you can try:
HP Pavilion Dv4, i7-2620M + AMD HD6750@RM3599 (ppl selling at around RM2.7k in Garage Sales) *Do note the processor is dual-core i7

Same as above 

Others to consider:
Asus N43SL, i5-2410M + Nvidia GT540M@RM2599[2.4kg][Bang & Olufsen]
Asus U41Sv, i5-2410M + Nvidia GT540M@RM2899[2.14kg]
Acer TimelineX 4830TG, i5-2410M + GT540M@RM2499[2.2kg]

Did these model support USB port 3.0 ?

Yes 

3.0 use high voltage or x? since if ex HDD 3.0 plug in 2.0 hub xoperate

More And Less Power

One of the big complaints that peripheral manufacturers had with USB 2.0 was the power limitations. Devices were restricted to just 500mA of power from a single powered port. This wasn't always enough to power some devices requiring that they either piggy off a second USB 2.0 port or have an external power adapter. This is especially true of many larger external storage devices such as DVD burners and desktop sized hard drives. The maximum power for USB 3.0 devices has increased up to 900mA off single bus-powered ports. Additional power is also available for suspended and unconfigured devices.

While the USB 3.0 specifications allow for additional power, they also are looking to reduce the overall power consumption of devices as well. There are a greater number of low powered states available for devices so they when the device or host is idle, less powered is used over the bus to the device. Some signaling changes have also been made so that less broadcast traffic is generated between a host and all the connected devices.

iirc, it is only backward compatible,

putting 3.0 into 2.0 wont work, but
putting 2.0 in 3.0 should work just fine

Asus N43SL, i5-2410M + Nvidia GT540M@RM2599[2.4kg][Bang & Olufsen]
Asus U41Sv, i5-2410M + Nvidia GT540M@RM2899[2.14kg]
Acer TimelineX 4830TG, i5-2410M + GT540M@RM2499[2.2kg]
Y470, i7-2630QM + Nvidia GT550M@RM2999[JBL]
HP Pavilion Dv4, i7-2620M + AMD HD6750@RM3599

As a conclusion, this 5 model also support USB 3.0 port ?
What is your suggestion to buy?^^

Asus N43SL, i5-2410M + Nvidia GT540M@RM2599[2.4kg][Bang & Olufsen]
Asus U41Sv, i5-2410M + Nvidia GT540M@RM2899[2.14kg]
Acer TimelineX 4830TG, i5-2410M + GT540M@RM2499[2.2kg]
Y470, i7-2630QM + Nvidia GT550M@RM2999[JBL]
HP Pavilion Dv4, i7-2620M + AMD HD6750@RM3599

As a conclusion, this 5 model also support USB 3.0 port ?
What is your suggestion to buy?^^

yup
Asus N43SL, i5-2410M + Nvidia GT540M@RM2599[2.4kg][Bang & Olufsen] for reliability and sales after service
Y470, i7-2630QM + Nvidia GT550M@RM2999[JBL] if you do graphics, thats ok.. and its a quad core... better than HP Pavilion Dv4, i7-2620M as it just dual core i7.

from asus my website

n43sl -> 1 x USB 3.0 port(s) (Optional)
u41sv -> 1x USB 3.0 port(s) (Optional)

if can wait, then wait 

As suggested by pandera999, its either N43Sl or Ideapad Y470, though I would recommend you to extend your warranty to 3 years for the Lenovo (which means forking out more money  , it'll be worth it, especially for a monster like that  )

---

Added on May 25, 2011, 11:51 am

Asus isn't really famous for its after sales services 

from asus my website

n43sl -> 1 x USB 3.0 port(s) (Optional)
u41sv -> 1x USB 3.0 port(s) (Optional)

if can wait, then wait 

i have try to call for the shop,

Asus N43SL, i5-2410M + Nvidia GT540M@RM2599[2.4kg][Bang & Olufsen]
(don't have USB 3.0 port)  =.="

Asus U41Sv, i5-2410M + Nvidia GT540M@RM2899[2.14kg]
(don't have USB 3.0 port)  =.="

For asus only i7 / 15'6 model having 3.0 usb port

Acer TimelineX 4830TG, i5-2410M + GT540M@RM2499[2.2kg]
(Yes, having stock)

Y470, i7-2630QM + Nvidia GT550M@RM2999[JBL]
(No Stock, Coming Soon)

So, i just can consider Acer & Y470. But if i wait for Y470, don't know when will be arrival. haiz.....

3.0 use high voltage or x? since if ex HDD 3.0 plug in 2.0 hub xoperate

iirc, it is only backward compatible,

putting 3.0 into 2.0 wont work, but
putting 2.0 in 3.0 should work just fine

USB 3.0 plug to 2.0 still can use...