my 5 year old PC took a crap last night. I tired to swap out the motherboard and the graphics cards (i have duplicates) no worky. It gets stuck on the bios screen. I bought a Macbook in November and i'm loving it. (most of the time) So I think it's time to buy an iMac. looking at the 20 inch models. I don't to too much besides surf the web D/L music, burn DVDs and edit photos a little bit. I plan to update the ram myself may be the harddrive too. My question is, Will i notice a difference between 2.0 and 2.4? is the $300 bucks worth it?