I replaced all 4 of my motor mounts using Rockauto. All the mounts was pretty much dead. The side mounts (transmission and timing belt side) looks 'OK' as the front and rear was pretty much gone, but the sides made the biggest difference in terms of the idle. All in all though, the motor mount made everything so much more tight and cut down on the noise.
Only thing is since I replaced the motor mounts, the engine isn't resting on the cross member that runs under the engine (the one that the front and rear mount attaches to) and now THAT thing is rattling because the rear cross member rubber bushing/gasket that attaches to the frame is shot.