In that case the UD5 is an excellent choice. Most people on here will recommend the patriot 1600mhz, but I personally use and like the corsair 1600mhz dominator.
That processor is a very unwise buy. Just because it costs five times as much does not make it five times quicker.
A 920 at 3.33ghz is exactly the same speed as the 975 at 3.33ghz, with the slight change that the 920 will be there through bsck so have higher memory bandwidth and so perform marginally better than the 975. If he's determined to buy a monster cpu, point him at the 950. However this is still a daft purchase over the 920 D0 stepping.