save your money son! get Darkbasic pro, ask me why?
well, 1st of all I have seen Game studio in use and basically if you are a C expert then that's one story, if not then trust me, it will take about 20lines of code to get just a sentense on middle of your screen, also Game studio will suit you after you graduate from uni of Game programming. Till then you better stick with Darkbasic!
if you are begginer then read below!
Let's say you have a month deadline and you desire to develop with Game studio. After 1month of deadline your boss are expecting a full working PACMAN! well it would take you a week or so to get your sprite on screen and give it AI control whereas DBPro it would take you hmmmmmm about 4-5hours!
Haaaa

you see what I mean
If I was you, I would purchase DBPro plus few Modellers e.g. Gamespace, Cartagory Shop,

and that tutorial DB Book!
heheeeee hope this helps!
think once play twice sleep third