Best Value Dongle? Ais? Truemove? Tot?

Hey guys,

I am currently Living in the Bang Bon/ Ban Kae are west of the city, coverage on the old Dongle to say the least is poor but sometimes 3G can be picked up...I have recently been using a AIS dongle with 12call sim on a 900Bht for 3GB or 3G + unlimited Edge plan

Just wondered if anyone can suggest where i might actually get a better deal (or better service!) using a different company?

Ive heard rumors that TOT are Okay in the area but they run a 1,500bht Unlimited package over 60days but im reluctant to shell out for it if im mainly going to be stuck on edge

Any suggestions or advice would be greatly appreciated!