I have two IKEA desks in my office for the two PCs. Both are great with clean, simple lines. They are deep enough that when I need to work on papers I just push the keyboard back and still have loads of room. Don't underestimate the need for depth of a desk. They have two tiny drawers which I don't use but that's because of other furniture I have in the office. You want at least 2' of depth to your desk (mine are 2'6")....unless you are ONLY gaming at it. However, I also push the keyboard back and grab my joystick/throttle combo too so even for gaming the depth is good.

IKEA have racks for mounting your PC off the floor but they are for standard PC cases, not the monstrosities I buy. Mine sits on the floor.

Simon