This.
Monster Hunter Freedom U, despite Gamespots low scores, the game is still top notch, something I'd buy if you are a fan of Action Games/Big Boss Fights/RPGs any of those 3.
Dissidia Final Fantasy: Intense combat, somewhat like Kingdom Hearts combat. It is a mash-up of the previous Final Fantasy's 1-12 (Including 11) of Good vs Evil and features 22 characters.
Crisis Core FF7: Only if you played FF7 will you fully enjoy it. Some people dislike the leveling, and it is a bit different. The reason playing FF7 first is a good idea is because it does give some background story to Zach, nothing severely major
FF Tactics: War of the Lions: Awesome game. Its based on a grid and combat is done that way, a really good game. If it is like the original PS1, you will be challenged somewhat.
Out of those 4 if you can only get one..
1) Dissidia Final Fantasy
2) Monster Hunter
3) Crisis Core
4) FFT





