I'm planning on buying a new iMac and the one I want has a 1.83GHz Intel Core Duo with 2MB shared L2 cache and I don't know much about that so is that good or should I spend the extra money and buy the 20 inch screen and that has a 2.0GHz Intel Core Duo with 2MB shared L2 cache. I don't really do much on the computer but surf the internet and chat on MSN and mess around with iTunes and photos.