Its time to upgrade and I'm wanting to drink the Mac kool-aid. Most intense things I have to run are AutoCad(yes will have to install windows) and Photo Shop with the possibility of other engineering programs like SolidWorks. My current laptop battery is shot so it has been a desktop for about the last 4 months at my house, and I have a computer at work I can use when I'm there. I have external monitors at both places so even if I have a 15" monitor it won't get used unless I'm on the road but in that case I won't be doing anything that demands the screen area, just checking e-mails, browsing the web and maybe uploading some pictures. My biggest concern is running AutoCad and being able to edit some photos when I need to, which won't be more than maybe 30% of the time. Will the new High end 13" cut it or should I go with the older model 15" with the 512mb graphics?