I mainly use a home computer for surfing the internet (with multiple IE/Netscape windows open at once) watching youtube videos, creating/listening to music cd's, and word processing. Money is not a concern but I am a value oriented purchaser in that I'd like to get the most out of what I spend. I'm coming from the Windows world where I would buy the best machine I could at the time and then replace it every 5 years. I was initiall attracted to the mac pro line, but they seem overpriced in general. From doing research, it seems like the sweet spot for me would be a white 24" iMac. I live in Arizona and the powerful sun coming into the room even with a 95% blockage sunshade would not be conducive to the new aluminum Imacs with the glossy screen. How long do you think a 24" White Imac model MA456LL released September 2006 with 2.16ghz Intel Core2 Duo, 2GB RAM, 250GB HD, NVIDIA GEForce 7300GT, Superdrive and OSX 10.4 will last before it shows signs of aging and obsolescence? Someone in my town has one for sale in in excellent condition with all software, manuals, packaging etc for $900. I priced out a new one (with a 2.0ghz processor) on Apple's website and it was $1299 plus shipping and tax. Is this a good price? Are there websites that shows used values of computers like there are for cars? Assuming the computer is used daily and is on 24/7, what percent should it depreciate each year? Is the Imac energy efficient when turned on 24/7 and put into sleep/hibernate mode when not around? Thank you all for your insights.