Just to be clear, it's not an issue of any CPU breaking down before 6 years... it's a matter of having a system that will be able to run updated software for the next 6 years. Even checking e-mail and surfing the web will be more CPU intensive as content becomes more and more bloated. You will need to run applettes by the score. Software venders are not going to assume that they need to keep apps under a certain size and speed requirement... even for the mundane tasks.
1) I don't want to reuse any parts from my old computer. I want to start all new. And it might be cheaper to buy used parts from eBay, but I haven't had the best experience with that so I want to steer clear of refurbished parts.
2) Eventually I do want to upgrade to Vista- but for now the plan is to buy XP.
It will be hard to get the whole system, w/ Windows, monitor, mouse, keyboard, and speakers for $800 without some serious compromises. Think more around $1000.
3) I'm not gaming and I don't plan to, so a simple yet fast computer is all I truly want.
So don't consider anything that says SLI. That's for TWO graphics cards, and you don't even need ONE. You want integrated video. Many people on this board don't understand the concept of a computer w/o a high speed graphics card.
Some questions that I still have-
Is a Dell really that reliable? It's affordable but overall is it going to be worth it?
Sure, they're reliable enough... their system will last for years and years (most likely). The issue is pricing on a low end system. Dell can easily throw in a low end monitor, speakers, Opperating system, decent mouse/keyboard, and they even come in a decent case (compared to the "bargains" you can get on the cheap from New Egg). If you buy these things yourself, you will likely opt for quality, and the prices will all add up, and before you know it, you busted your budget.
At a higher price range, don't buy Dell (or Gateway, or HP, or whoever else is still making computers). At the low end, it's very hard to beat their price/performance combo.
If I continue with building my own- it seems to be split between the Pentium 805 and the Athlon X2 3800. If I go with the Athlon, which motherboard would be sufficient?
here you go
Integrated graphics, supports the AM2 line of CPUs (the current generation), and it's a microATX as well... so you could put this in a small tower or a Q-Pac case... plus it's loaded w/ features like all your USBs, firewire, supports the current SATA drives, has a PCIe for a graphics card (if you ever get the urge), etc etc. And it's well under $100 shipped.