What Final Fantasy game should I buy next?

I've played XIII, XIII-2, and I'm playing through X and X-2 now. I want to play some of the earlier ones. Any suggestions on which ones are best?

There's 7,8,9. Those are pretty good. Not as good as XIII tho.
:3

Final Fantasy 1- Its for the nes, GBA and PSP. I would rate it a 7/10

Final fantasy 2-its for the same systems as number 1. I would rate it a 4/10

Final Fantasy 3-its for nes, Ds, Iphone and I think its also for GBA not sure… I would rate it 8/10

Final fantasy 4-This one's really good and has a great story and memorable characters! Its for snes, GBA, PSP, DS, IPHONE and Playstation. I would rate it 9/10

Final Fantasy 5-Probably my favorite one hands down, the job system is really awesome and fun! Its for Playstation, GBA, SNES and Iphone. I would rate it 10/10.

Final Fantasy 6- I haven't played this one but its supposed to be the best FF. Its for snes, GBA, Playstation I don't know if its for Iphone and I'm pretty sure their making a remake of it for 3DS. I don't have a rating.

Final fantasy 7- The king of all final Fantasy games! This is the one that everyone absoulutely loves! Fantastic Characters Amazing Story and Breathtaking music! Its only for Playstation and PC. GET IT NOW! Rate it 9.5/10

Final Fantasy 8- This one is a bit strange, I never got really far in this one cause I find the battle system very diffrent and a bit strange. Its for Playstation and maybe PC? I don't know. Sorry I don't know anything else lol No Rating.

Final Fantasy 9- Haven't played it but my brother says its garbage lol. No rating.

Final Fanasty 12- I watched my brother played it, it looks alright the battle system is almost like Bioware's Star wars old republic and Dragon Age.