Well Im thinking aobut getting the 350.
Ill be running a Maze3, a GF3 D-Den block, Black Ice Pro (Blue

), with all 1/2 hose.
My case is really small to enclose all the stuff, Im thinkin Im gonna mount the rad on the top.
This is kinda what my case looks like, except the support bar though the middle is moved up about 2 inches.
So I have some room under the HDD rack.