hi micheal..
ive also tried the OSX skins with window blinds and similar programs and i find that it really nice looking but you lose a lot of system resources because the whole thing is so graphics intensive..
The only gain in performance i used to get was in WIN98 when i used to have the shell replacement LITESTEP. It was way faster than the windows gui and you could do everything the same as windows with it.. it was also less a strain on my resources.
If you look at the normal windows XP gui, its pretty but some slower machines struggle with it, I just turn it back to classic look and it works fine for me..
Macs were made the way they are to look good and have funtionality to boot.. PC's got stuck with the funtionality first and only now are we seeing better looking gui's.
IMHO, dont bother with the shell replacements.. they add little funtionality and if anything will drive you up the wall with all their little settings...
btw, be carefull if your using a program like litestep because ive messed with it a few times and wiped my desktop completely. Always make a new screen name to mess with in first and then port it to your main screen name.
good luck.
its 1.45 in the morning so if im not makign sense, thats why! :hit