Looking for a good FPS on Mac OS X Lion I'm looking for a good FPS (read like COD4) on Mac OS X Lion. I'm particular about this point as some of the old games don't install or even don't run at all even when copied from a previous install due to the missing rosetta layer in Lion.

I already own all the steam play FPSs on steam, Modern Combat domination, Uberstrike and Red Crucible 2.

Are there other gems you could recommend. I know they are not all on the App Store and on Steam. And actually good mods for HL2, or Quake 3 would be welcome.

I don't feel like paying for COD4 a 4th time I already bought it twice due to a lost installation key and once more on steam when I till had a windows computer. Mainly as the current price is 6 times superior to what I paid on steam.
A game that I've loved for a long time, with a pretty good online community is uRt.

ioUrbanTerror is a FPS built on the quake engine utilizing speed across successive jumps, squat-sliding at speed, and modern swat vs terrorist weapons and maps that could be compared to Counter Strike source.