use a zboard merc coupled with an mx518, my only beef with the merc (which i've found to be good and comfy to use) is the extra couple of inches in length, which isn't a lot but on my desk takes most of the shelf space, and zboard have doubled up the page up/down / delete and home keys etc on the num pad, so to use them u have to turn off the num lock which can be a tad annoying sometimes but other than that great board.