Need New Hardware - Advice on Craigslist Ads?

[cusconillow]

So I really don't want to spend a lot of money right now but I need a better computer. I'm currently running an ASUS A8N-SLI Deluxe motherboard with an EVGA e-GeForce 8800GT on Windows 7 and it's not working as well as I'd like it to. So I am finding a lot of craigslist deals but I don't know enough about computer hardware to tell if they are good enough deals to jump on. Would you guys mind helping me?

Gigabyte B75M-HD3 + Intel i3-3220 ($90)
http://raleigh.craigslist.org/ele/4405276480.html

Gigabyte Z87x-OC + Intel i5-4670k ($359)
http://raleigh.craigslist.org/sys/4466044192.html

Intel i7 4770k + EVGA Z87 Stinger ($455) (If I got this, I would likely sell the mobo since it's a mini-ITX)
http://raleigh.craigslist.org/sys/4440807765.html

Intel Build Gaming Computer ($450)
http://raleigh.craigslist.org/sys/4440536321.html

Intel i7 3820 + MSI X79A-GD45 ($469)
http://raleigh.craigslist.org/sys/4466066215.html

Midrange Gaming PC ($350)
http://raleigh.craigslist.org/sys/4466042770.html

Midrange Gaming PC ($350)
http://raleigh.craigslist.org/sys/4433860786.html


Sorry there are so many dang ads to sort through. I just really want to make sure I get hardware for a price I can actually afford.

 

[cusconillow]

I also found these:

AMD FX-8350 + Gigabyte 9A-990FXA-UD3 ($120)
http://raleigh.craigslist.org/sys/4432105674.html

Intel i7-750 ($65)
http://raleigh.craigslist.org/sys/4372307434.html

PNY nVIDIA GeForce 9800 GTX+
http://raleigh.craigslist.org/sys/4408371673.html

Alienware M14
http://raleigh.craigslist.org/sys/4471341353.html