Actually, if you have a ps3, I recommend downloading FES. It's much cheaper(only $10), it actually has the proper graphics and cutscenes, and I prefer its battle system, despite the lack of direct battle commands. Plus, when you return to the lobby in P3 FES, all your hp and sp are restored, whereas in P3P, it's not, which is a confusing design choice, given that the game should have been made more convenient for portable gaming, not less convenient. I could list all my problems with P4, a lot of which made their way into P3P, but that'd take a while. I do miss fusion spells though. I say, P3 FES is the definitive male version of P3. I'd only recommend P3P for the female version. I would recommend trying P4 too. If you plan on getting a Vita, you should probably wait for that version.
I never quite got into Devil Survivor, but Overclocked is the definitive version, and is available for the 3DS. A 3DS will play Devil Survivor 2, due to b/c. Same with Strange Journey, but I'm not sure how easy it is to find at this point. Those last few recommendations will only work if you eventually get a 3DS. Unfortunately, the majority of ps2 Megaten games are inaccessible to you, due to lack of b/c. I'd start with FES though. It's easy to acquire, and won't hurt your wallet too much. Plus, it's one of my favorite games of all time, and it'll take you quite a while to finish all of it, if you play through the Answer too(probably well over 100 hours).