Play Persona 4 Golden. If you like that, look into Persona 3 FES(PS2 Classic available on PS3) and avoid Persona 3 Portable. P1 & P2 are nothing like P3 & P4. I heard P1 was meh and P2 IS was good. I am actually looking into getting P2 IS at somepoint
Currently Playing: PlayStation All-Stars(PSV), Naruto UNSG(PS3), inFAMOUS(PS3), Persona 4 The Golden(PSV), Growlanser WoT(PSP) & Persona 4 Arena (PS3)
You don't have to play any of the other games at all, but honestly, I would suggest if you decide to play Persona 4, play Persona 3 (Portable if you'd prefer on the go) first, because from what I've read on the P4 boards, most people don't wanna go to back P3, just because they enjoy P4 THAT much more. Persona 1&2 have a MUCH different style of play from P3 & P4, so I'm not sure if you'd like those two.
"The world ends with you [...] push out your horizons as far as they'll go." - Sanae Hanekoma. Org. XIII Name(s) - Reltyx/Xrelty