Anybody has a suggestion for a desk for my 27" iMac? I'm looking for an affordable mobile desk that has wheels on the bottom, kinda like a computer cart? I'm looking at the ones at Walmart but it looks like they are not strong enough to withstand the weight of my iMac. Any suggestions will be greatly appreciated. An example would be the iGo desk http://raindesigninc.com/store/product_info.php?products_id=67 but this is too expensive for me, I'm looking to spend only up to $200 if possible. Thanks.