You can play all of the games except for 11, 12 and most of the spinoffs on a PS3. Otherwise, the best choice is probably a DS or a PSP. The ds has 3d versions of 3 and 4, and you can play the gameboy versions of 1,2,4,5, and 6, as well as Ta and Ta2. The PSP has the best versions of 1,2,3, and 4, and you can also play 5,6,7,8,9, crisis core, and Tactics.

Tis up to you.
The worst system would be an Xbox.