There is an FF8's pc version, you dont have to emulate it. There's also an online version on pc, FFXI (well, go for it if you have money :p)
Speaking of FF series on PSX (FF7,8,9, FFT) and PS2 (FFX,X-2,FFXII,FF7DoC), there are 2 ways for you: playing on ps2 or emulating on pc. The ones on Psx are not a problem if you wanna emulate them on pc but those on PS2 are another story. You need a really powerful rig to run pcsx2 (a ps2 emulator) at enjoyable speed. So, I prefer a ps2 which can play psx's games as well.
Getting a ps3 at this time is not ideal unless you want a cheap bluray drive