I am buying either a MacBook or an iMac this week. However, I am a mechanical engineer who needs to use PC CAD software a lot (specifically, Pro/E -- comparable to Autocad). I hate to buy a copy of WindowsXP since it is so old, ugly, etc. and would makeup about 10% of the entire cost of the Mac I'll be buying despite only being used for one application! Therefore, I wonder whether or not just downloading the beta (& thus free) Vista RC2 would be a viable alternative. Can anyone tell me whether or not Vista RC2 would be a good substitute for buying XP just to run one application (Pro/E)??