There are some really good originals for PS1, Steel Reign is one of my favorites (it's a futuristic tank game). Several of the games I have are really good, even some of the sequels such as Jet Moto 2 or Ace Combat 2, although I might be saying that because I never played the originals. My collection list can be found
here, you can ask me if you have a question about any of them.
I remember reading that Sony bought Bleem in order to stop sales since it wasn't illegal, Sony basically hates when the community does smart stuff (especially modifications) with their products. Anyway, you can download an emulator such as ePSXe, but they give a warning that it's illegal to have the PlayStation BIOS (which is required to use ePSXe) unless you own the actual console.