Sorry was in a hurry when I posted this. I wasn't sure which section to post in since my question may have multiple answers from different hardware sections. :4-dontknoWhat is your question? Is your query different from the post you linked to?
The hard drive is where all the drivers are located, so if any were downloaded for your motherboard then they will still exist when you swap the stuff over. The only problem is when you get a new motherboard, you will have the wrong drivers installed on your system - you should uninstall all motherboard drivers from your system before adding the new hardware.
Your PC isn't too power hungry, though i'd suggest a 500W/600W PSU with 19A on the 12v rail. You can see what amps are on the 12v rail by looking on the box or side of a PSU - you aren't a gamer as you said and dont have power intensive hardware, so that will do you fine.
A few more question though:
You say un-install any motherboard drivers b4 upgrade. Do I do this through device manager? Also I would assume when I do this I would I have installed any drivers (to my hard drive) for the new motherboard. Then I would shut'er down and swap the mother board/CPU and what then? I am a bit confused here; how will my PC be able to work if I un-install my drivers for the mother board? If I have the drives on my hard drive would the motherboard know what to do...I would assume because it is the "motherboard" it would need to work for I would be able to boot properly. :4-dontkno
Any good resource you know of w/ instructions would be appreciated. The company I am purchasing from stated in there listing (ebay) that no instructions are included. They did state they would assist w/ any install problems...but you can never be to sure.
I found this link for you; http://michaelstevenstech.com/moving_xp.html
By the way, in many instances you dont need any pre-installed software (except Windows of course) such as chipset drivers for the computer to operate, you just won't get what you normally would out of the computer.
You shouldn't put your old HDD in when you add the new motherboard, otherwise things could get a bit sticky. If you have any further questions feel free to reply and i'll answer asap.