I've been looking at monoprice wall mounts lately too. A lot of the reviews mention cheap lag bolts, so I'd recommend spending a few bucks at the hardware store for some heavy-duty ones.
Also, a lot of people like the way a low-profile mount (~1 inch from wall) looks, so you might want to consider one of those instead of the tilting mount (~4 inches from wall). It's a bear to connect new cables behind a low-profile mount, so I'd recommend connecting extra cables to your TV before mounting it so that they'll be ready and waiting for any new equipment you need to connect.