Hello Everyone! This is my first post, so it's a bit longer than I would normally write.. (I hope this is the right section, if not, mods.. do your thing!) Ok, I've switched to Mac 3 years ago by buying a Macbook I've never had any problems (well.. a part from a few fans).. I love my mb! I used to be a hardcore windows user (I've got M$ heritage).. but no longer! Anyways, to get to the point, I've now gotten into video editing (CS4), after moving from photography. This is all great fun until I start editing... At the moment I have to convert my AVCHD files to mov in iMovie, since even though Premiere can handle these files my macbook can't.. (I know it's suicidal to edit HD on a Macbook with FW400!) So I'm looking for a new Mac, and don't want to spend more than necessary, but I wan't something that will keep up with me the same amount of time. (3 years) Also want to get into AfterEffects, which I haven't even contemplated on my MB. Do I go for a 21.5" iMac with the 4670 and 4/8Gb? Or Do I go for the 27" i5? I like the idea of a quad, but don't want to spend money for nothing.. I'm also looking at a external storage, either a Drobo, or something similar.. Also the nice thing about the 21.5" is that I could hook up my current monitor (22") as a second screen, no? Any performance loss doing that? Can I put away the cord and razorblades when I get a 21.5" iMac, or will it still not be super fast.. Hope you guys can fill me in on this... FL. Made my mum buy the baseline iMac the other day, but I have no easy access to her machine at the moment, so can't try the video edits.