Right now, I have a 2000 imac 500 mhz machine, and was able to update software to 2008, before the new intel processors came out. it still works great! But I do not know what to replace it with. I want a mac that will last a long time before replacing it. Would you go for the 17 inch screen macbook pro, or the best imac. I am confused because I am not an advanced user and either one would work fine. If you had $3000 to spend what would you all' buy?