I'm with Tsyr and JeffB, I much prefered WEG Star Wars to d20. I just don't like the class system at all, I find skills to be much more realistic and easy-to-use, especially when you're looking for a character concept that can't be represented by pre-made classes. There are a couple weaknesses to the rules, sensors and explosives being the most noticable to me, but I just followed the 'ol Golden Rule (when in doubt, pick an appropriate skill, pick a difficulty, roll and compare) on a case-by-case basis and it worked out fine.
I think CoC d20 is well-done, having nixed classes, but I can't compare it to the old version because I haven't read or played that one. Perhaps they should have made HP equal Con+level or something like that (a gun doesn't much care what level you are). Still good, though.