I need help buying a desktop

Efro

Honorable
Mar 15, 2012
7
0
10,510
I need help buying a desktop?!!?
Which of these computers would you recommend for me to purchase?
I'm planning to purchase a desktop for home so that my high school sister can do her homework and web surfing. I don't really want to spend a lot as I know that she will probably be needing a laptop in about 3 years when she heads to college plus being a college student myself I don't have lots of money.
I've narrowed my choices down to this. Hope you can help me choose one. (I did a little research on each and their processors but would like an opinion from someone else.) Im looking for something that may last and can possibly be upgraded. The last desktop we had was a Celeron processor and it lasted us about 5 years so far.
Thank you in advance :)
Here are the links and descriptions and if you have better suggestions I'll consider them too:
HP Compaq DC7700 Desktop Computer - Intel Core 2 Duo 2.8GHz, 2GB DDR2, 160GB HDD, DVDRW, Windows 7 Home Premuim (Off-Lease)$169.99

http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=1976949&SRCCODE=STPRICE&cm_mmc_o=2mHCjCmByf5ybgwCjCVqHCjCdwwp&cpncode=21-206589180-2

Intel Core 2 Duo E4700 Computer System$154.99
http://www.ascendtech.us/intel-core-2-duo-e4700-computer-system_i_dtgwdx4640ubc01.aspx?agent=pricewatch

Or any from these website?http://stores.ebay.com/TechDealsNow1/_i.html?_fsub=2053055016

or should i just stay with known companies like tigerdirect

Additional Details
Ive been suggested that the first one fro 169.99 HP compaq would be a good buy.
I would like to buy this by the atleast the end of the day.
Thanks again, hope you can give me more info/opinion.