Help Buying New Desktop Computer

[Resistance]

Yeah I got some money and... I am really unsure compared to some professionals here at HF on what hardware to buy for a good priced computer under $1000.00 USD. I have my eye on stuff like This and probably something in these results. Please help me decide for a really good one that would last some time, its only for my House and brother so he can work on his homework, do research no gaming. Really unsure what to get here. My specs are:

Computer Manufacturer: Hewlett-Packed (HP)

Intel Core Processor 2xQuad i7 (if possible), if not, i5.

At least 6 GB RAM/Memory

At least 640 GB HDD, 1 TB or higher would be great!

HD Audio CODEC

20+ in. Monitor

Microsoft Windows® 7 Home Premium, 64-bit

And an HD Graphics Card would be Insane.