You're in luck. This is basically the premiere place for models for SFC. As for finding models for SFC2/OP, you could try the community docks at
www.battleclinic.com Tons of ships from various modellers there. Also, somewhere else in this forum there should be a thread with a whole bunch of links to different models sites with models for all versions of the game.
Also, WZ's ships are some of the best around. His new address is
www.universeatwar.org/drs His ships all come with models for each version of SFC: SFC1, SFC2/OP, and SFC3.
There are also various mods out there for SFC2/OP and SFC3, and each mod has tons of new models and shiplists to make the game so much more exciting.
www.sfcx.org is a good place to start.
Anyone else have anything to add?