I am considering a new laptop. Currently I have a 1ghz 768mb 12" PB. I really love the machine but it is starting to lag -- even when watching avi files on VLC. My main complaint, however, is the lack of a high resolution and a not-so-bright screen. I know universal support is becoming more and more widespread, but I'd like to spend as little money as possible to get a machine that will make me happy and do all I need it to do for three to four years. Is it even worth considering buying a high-res 15" Powerbook or is the new Inter Macs the way to go? I am not really sure how much I could get a used 15" PB for, but my guess would be less than a Macbook. If that really isn't a smart option (and I know it really isn't as I could benefit from being able to run Windows-only apps without having to go through the hassles of Virtual PC), what are the main differences between the Macbook and the Macbook Pro? I know the screen resolution is much better on the MBP so I assume the screen will be much brighter? And how much memory do I really need? Is 512 enough (usually the refurbed store has the 512 versions) for what I do ie., Fire Fox , Word, TextEdit, Dictionary, Colloquy, iCal, iTunes, VLC, Adium, Terminal, and Preview open all at once. I know the adage "the more ram the better", but will 512 suit me for the next few years running 10.5? I would really like to buy a refurbished machine so I am at the mercy of what Apple puts out. And I do not feel comfortable installing ram myself. Next would be processors. I don't really care about the GHz. But how will the C2D or C2D Santa Rose affect my performance? Is it really needed or will a CD be fine for the next few years? I don't see what applications I would have that would need 64-bit processing power. Past the applications listed above that I always have open, I do open Cyberduck (ftp program), Chess, Address Book, Photoshop (the most I use it for is to write something on a picture, resize and Save for Web), Acrobat Pro, Azureus, Calculator, Google Earth, Image Capture, Mathematica, StuffIt, and UnRarX. Should I consider the MBP due to the larger screen, assumed higher brightness (I am not sure if this is true...), and most importantly, the higher screen resolution or is the 1280x1024 screen resolution going to appear so much sharper than my current 1024x768 res? I don't mind spending another $500 iff the screen is much better. I don't think I'd ever hook up a 30" screen, but I may a few years down the road. And if that's the case, then I know I need the MBP, but I don't think I'd have any qualms about "only" having a 23" ACD. Thanks for your help. I really need help finding the best machine for me that will last me three to four years.