I'd be up for some Unreal Tournament 2003, and maybe some plain ol' Unreal Tournament (it's hard to go back once you get used to the gameplay and eye candy of UT2003).
Not really-- the original UT has an OS X patch, but it's not complete and is pretty laggy. The reason UT2k3 falls into single digits is because your system is under 1 GHz. Don't fall for the system requirements and say your machine is above them - the requirements listed for UT2k3 on the box are below smooth gameplay. =)Is UT OSX compatible? I might go out and pick up a copy.... I hate how even on my awesome system my frames sometimes drop into single digits... what's up with that?!