I dunno. I'm not really interested in any of these. Final Fantasy Tactics was a good game, but for slightly prettier graphics I'm certainly not going to pay 40 bucks when I already own it. I could care less about ANOTHER FFVII game. I wasn't that big an FFVII fan in the first place (my favorites are VI, IX, and IV) so I really don't see myself paying for that. Especially considering how bad their last milking attempt (Dirge of Cerberus) was.
I'm sure God of War will be a really fun game, but I have already played it twice. God of War and God of War 2 were great games but let's face it: they were damn near identical to each other. I really don't want to buy a PSP again to play the same game a 3rd time but on a smaller screen with worse graphics. I may be interested in Dissidia if I had ANY idea what it is (which no one does). Also Dissidia and Crisis Core are 08 PSP releases in North America not 07. Crisis Core isn't even out in Japan till september, and Dissidia doesn't even have an 07 Japanese release date. So yeah, you really should keep your list 2007 releases if you are going to make it "Why you need a PSP this year" rather than "Why you need a PSP eventually."
Still, although none of these really appeal to me I'm sure they are awesome for some people. They all look great too. The obviously put a lot of effort into polishing the graphics. It's looking like it will be a good couple of years for PSP owners.
Edit: I'll go ahead and start on a DS version as long as no one else has.
