You can buy the Steam version for literally $3 when it's on sale. But if you'd really rather play the PS3 version, I'm sure there's probably a GOTY or something that fixes a lot of the bugs by now? I guess I don't know.

Order of quality:

Fallout 2
Fallout 1
New Vegas (or Morrowind, not sure)
Morrowind (but possibly New Vegas)
Skryim
Fallout 3
Oblivion

I haven't played any Elder Scrolls games besides those three and Fallout Tactics is disqualified from counting as part of the series.