Prototype, he mentioned that this computer is for his 'Grandpa' for the use of checking emails, surfing the web, and typing word documents. Do you really think he is going to overclock this machine?
- Integrated graphics will be absolutely fine.
- I would suggest buying a separate power supply though; power supplies that come with cases tend to be poorly made. 400watt would probably be fine, 450watt would be for sure fine/safest. The +12V rail(s) is what is important.
- That CPU will be just fine for this type of computer, he'll be very happy with it. I don't know how it compares (at $80) to what Intel has at $80 (I bet very similar), but he'll be happy with the 4450e speed and performance.
As for the motherboard, I'd wait for someone with better knowledge with motherboards than I have to suggest if another board would be better @ that price range.
With that $100 I'd buy a better case and the power supply. A case like the one I have (Cooler Master Centurion 5) is a good case for the price ($45) and cools quite nicely. As for the power supply, I'd probably go with a Thermaltake or FSP Group power supply; they are a good bang for the buck PSU at the 400w-450w range. Antec and OCZ are some other good PSU, although they are more spendy.
Newegg.com - FSP Group SAGA+ 400R ATX12V 400W Power Supply 120/220 - 240v NEMKO, TUV, CSA, IEC, UL, CE - Power Supplies
- Something like this would be good..it's not pretty but definitely gets the job done nicely (I'd know because it's what I'm using, hehe).
Also, don't forget about the operating system! and a CD/DVD drive if you don't have an extra lying around.