Im sorry, but, for things like games, raid isn't really going to give you a perceivable speed increase. Most games today get the most use from the random read, where raid does best is with things like sequencial writes (large movies, etc).
Raid0 will add to your throughput, but your seek times will still be the same regardless of how many drives you add to it.
Here in the us, a 2tb ssd is less than 50$. Im sorry its not the same where you are at.
I know the others suggest raid0, but since youre doing three drives im gonna suggest raid 5 instead. You don't lose out on read performance compared to raid0, just write speeds. More importantly, one drive failing wont actually break anything.