Edit. forgot to say he would like to play on stock without OCing
Edited because of this which wasn't posted when I wrote it!
Well next month will a be a big deal since the next Intel cpus, motherboards and the first Nvidia card are due to be released but the basics remain the same.
Forgive me for doing rough calculations in £s but it's easier for me since I know that market! Just to give you some bones to build on...
CPU
i5 2500k or Ivy Bridge equivalent (~£170)
Cheapish aftermarket cooler since not OCing, I'm no expert at this range.. (£20)
Board & RAM
z68 or z77 mobo, lots of good ones out there but you might as well look for a pci-e 3.0 now (~£190)
Generic 8gb of ram, ram speed isn't important for gaming. Maybe some corsair vengeance 1866 (~£60)
HDDs/SSDs
120gb SSD, I would recommend an Intel 520 (~£150)
Generic HDD for storage. Size and price depending on how much he needs but they are expensive at the moment, a WD caviar black 1 tb is amongst the best (~£110)
GPU
7970/7950 or 660ti when it comes out. A sapphire 7950 is a nice card (~£350). I wouldn't go 5xx series.
PSU
corsair 850 (£110)
= £1160 (1400 euros)