Firstly, you may want to go with the sugo sgo5b case a pop out cd tray for the dvd drive as the push in style leave nasty looking gaps.
Also you can fit a bit more powerfull card such as the 4850 or 260, in that case with some inventive cable mangement.
Other than that looks ok, the board can handle a 1066 fsb cpu btw, only the ram is limited to 800
spec looks good for the uses you have specified althought maybe a cheaper option to build a shuttle barebone if your mostly web browsing etc.
Hey black hat, love your cubit build btw and your replies to the sg05 thread were very helpful. Any recommendations on a shuttle?