I've been looking at getting a new 15" MacBook Pro to use for when I can't be with my imac. However, I'm going nuts trying to figure out what specs I want it to have. At the moment it would be used as a secondary computer, for traveling, working with in the office (at the moment I always work from home) for photoshop, illustrator, indesign and flash work. I'd like enough power so in case I do have to use it more for on-site work that it won't slow me down. I also wouldn't be saving a heck of a lot of stuff on it. So, what specs should I be looking at; 2gb vs 4gb, Serial ATA? 512MB? 7200 RPM ? All the numbers are making my mind numb! Also, I'm not in a dire need to have this right now, but am a professional and feel I should be mobile with this stuff like the rest of the population. Is this a good enough reason to go out and get a nice and shiny new Pro, or should I hold out until I really-really-really need it?