for the mobo i would suggest not getting the expert as it has had a few problems.
If, money is no object and you want the best proccedor, imho i would say wait till the new line of Intel proccesors come out(yeah, i said it). these proc's should be really, really fast.
For the video card i suggest EVGA. I think all the gtx's are sold out right ow, so the only place to find them is ebay or some store carry them(I think i saw one in bestbuy the other day....weird)
For the psu, i would suppose you could buy a 750 watt if you wanted, but that would be overkill imho. 600 should be fine.
if you have little knowledge of watercooling i say stay away. since you are not oc'ing just get some air coolers like a zalman and a few fans.
also i suggest getting 2 x 1Gb of ram, you will thank me in the future.
p.s. nice choice on the mouse and keyboard, you will be happy with them.