You guys probably get a lot of these threads, but for me, it's a weird experience. I've been a longtime Windows supporter that is finally considering switching to the Mac in order to use iMovie as a student, and am looking for advice. I use a Dell Adamo and iPhone 4 already, so I'm looking for a Apple computer that for under $700 can provide me with a OS X experience I can later upgrade to Lion with. Obviously this would be a used Mac, so I'm looking for where I should look and specifically *what* kind of Macs I should be looking for. I'd need a Mac with an Intel Core 2 Duo, that's pretty much it. I'm not sure if I should get a iMac, but since I already have an ultraportable PC and my budget is $700 with this, I'm wondering if there's any Macs I should be looking for. More advice is what Windows users who switched to the Mac can recommend to me. Accessories, tips, etc. Also, what to do if you are in a Windows environment and want to use Keynote, for example. If I got an iMac, I can't really take it with me to present, but a MacBook might not be powerful enough for example.