Hi all- im thinking of replacing my old Mac desk top with a good, high endish, new PC gaming machine (primarily to play new Rome Total War 2)- any one have any ideas where to buy?

Pantip I think is the place to go for that.

I think the other alternative is to build one from scratch which is probably not too bad to do if you source from around Bangkok

I built my gaming rig with items sourced from Panthip. Works pretty well though the 1000W power unit failed after a month. The second one has been going strong for over a year.

There are many stores like Banana it( although website sucks),invade-it,jedicool. You can make 25,000baht(with monitor) gaming pc that will play any game for next 2 year almost to max settings at 1080p