I'm going to purchase an iMac within the next month or so, and I'm trying to figure out if I should buy the 20" or 24". For the record, it stands between the 2.4 20" and the 2.4 24". I currently have a Macbook which I use together with a 22" LG display. The LG display is only two months old, so I could still sell for good money and put them in a 24" iMac, or i could keep it and buy 20" iMac and use them both together. Obviously, keeping the LG display and going for the 20" iMac would give me more real estate. More Real estate would come in handy, but I don't really need it for anything special. The deal breaker here is however that i get to save some money. Having just the 24" would allow for a more clean desk, which would be nice since my desk would be pretty full with the LG display, 20" iMac, speakers, keyboard and mouse and the MacBook. However I am leaning towards the 20" iMac + external display, simply because it would allow me to save a bit of money and give me more screen real estate. So i guess my real question is, is there any disadvantages with having the iMac run an external display? Any other thoughts?