Buying New Laptop In Bkk

hey

im arriving to bkk and i only have 3-4 hours to shop for a new laptop.

my budget is 20000 baht, but ill be happy to get for much less.

i want it to have 1 giga memory, wifi and dual core.

can u recommand for a cheap place to get it ? maybe pantip? does all the shops r almost the same ? can they cheat me in any way ?

can u reccomand for a good shop ?

does any brand is better then the other ?

i will only use this machine for movies and music .. and i also have external hd of 300 gigs so i dont need much space.

thanks 4 all your help