Ya know what? I second that guru. You're gonna be sapping a lot of HD space with mapping n' such, space in your case is plenty more important that speed. You probably will barely feel the diff between the 2, it's mainly just specs on paper, in real life if you got them both to compile a level, I'd probably have a difference in maybe 10-30 seconds man. That's like standing up, streching for a few seconds, relax your eyes (you're supposed to look 10 seconds off your monitor every 20-30 mins anywho to keep them in prime shape), maybe get a quick drink and come back. There, more healthy than testing that level out right away now ain't it?
Ahh, I just stretched, ain't it great how you get that little surge of pain, then you feel somekindof natural body painkillers kick in?