Budget gaming rig for a friend

I an trying to build a budget gaming rig for a friend, me and my other friends will probably end up paying for most of it if not all.

His current system is:
Athlon 2 X2 250
AM3 Motherboard (Do not remember the model but it is not AM3+)
4GB DDR3-1333
GTS 450
XION 700w PSU (terrible)
2x 1TB 7200 RPM hard drives.
Case: Unknown.

This is the current new build I have thus far:
http://pcpartpicker.com/p/GCfm23

I already own the Z97 motherboard so that is of no cost to me which is why I chose an Intel rig.
I am unsure between the i5-4440 or the i5-4590, and yes I know it is not overclockable.
He is pretty insistent on nVidia versus AMD GPU's, however I do believe the 280 is a better value than the 760.
What I am looking for is potential ways to make it cheaper, and I am open to AMD options as well. I don't want to cut to much on quality as he tends to use the same computer for 5-6 years, (until he can't play anything on low). I realize the 750 Ti is an option as well, his resolution is 1920x1080.

Pretty much any computer would be better than what he has now. I am trying to see what parts I can scrounge up from my friends to cut down on the cost. Also is this PSU rather reliable, I tend to only use SeaSonic.
 

M0j0jojo

Honorable
You can overclock a non "K" version of the i5s but not a lot. and yes r9 280 would be a better option for this build.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($194.99 @ Newegg)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard (Purchased For $0.00)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory ($76.50 @ Newegg)
Video Card: Gigabyte Radeon R9 280 3GB WINDFORCE Video Card ($199.99 @ Newegg)
Power Supply: Rosewill Hive 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($39.99 @ Newegg)
Total: $511.47
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-11 13:58 EDT-0400