Not the same model as OP was asking about, but I decided to downgrade my large SLi rig with 1000w psu to a shuttle SX48P2-deluxe
I've been a fan of shuttles pretty much for the last 10 years and have owned more than a few without any real issues
My plan was to stick one of my GTX280's in, and temporarilly donate an E8400 from my SG31 till I can get a good E8600 or Q9650
Got the XPC delivered yesterday and am up and running with the above kit plus 3x 500gb HD's and managed to clock the E8400 to 3.6 [400fsb] had to buy some ddr3 tho but that was less than a ton for 4 gig of XMS3 Dominator. Fans are all set to low and super silent in bios which is a bonus.
One word of caution tho, the SX48P2 Deluxe I have has a 4 way power connector in same location as above pic but it is mounted horizontally, there's no way my GTX280 would fit in a 35 if the connector is as shown in above pic, I believe shuttle originally had it as above in earlier models but then changed the orientation to allow for the really long cards.