First off, I'd like to say that I just recently joined the world of Mac by becoming the proud owner of a 17" 1.83ghz Intel Core Duo iMac (this is my first Mac!). Although it's a little underpowered compared to the brand new machines that are out now, it has been more than adequate for everything I've thrown at it so far (even Creative Suite 2 applications). The only slight slowdown I've noticed is when I open a decent number of things and lots of tabs open on Firefox, and it's mainly on the dock animations or scrolling on websites while video is running (YouTube is a good example of this) Anyways, I currently have 1gig of ram (2x512) and I'm considering maxing it out to 2gigs. My only concern is if it will really make a big difference. I mainly use my computer for design, and I really have no interest in gaming on it or anything (I have a 360 and Wii for that). I don't exactly have the cash to be throwing away at this point, but I'd still like to max it out eventually. Also, would I run into any problems if I bought a 1gig stick now, replaced one of the 512s, and then purchased another 1gig stick down the road? Or should I not upgrade at all? Any help is appreciated! Thanks.