Here's the site I primarily use for PS1 (X) roms:
Thing is, it's been giving me grief lately, can't get to the roms section for some reason.
Also what's piss taking is all the games are cut up into small winRAR files, some games consist of 20+ files, which can only be downloaded one at a time, too!
Plus the choice is limited.
But it is what it is, I also use my old game CDs and rip them to play on my ePSXe