Look on gameing sites for other games you might like;
GTA: Vice city
GTA 3
Max payne 1&2
Quake
Doom
Stratagy games
Wargames
Puzzle games
Adventure Games
Action Games
Racing games
There are heaps more games you would probably want to play
and you can always upgrade the parts you already have, 3000 seems like a lof of money for someone your age to have.