[YVEYANT]

I use the Dewalt cups also and I also have a Milwaukee grinder. Mine is a 4 1/2" angle grinder. The cups come in a 4" and 4 1/2". Be careful withthese they fly the metal bits around like crazy. Be sure to use eye protection. A better alternative and safer is from Eastwood, they sell 3m cups that are a green hard material not metal that works very well and does not dart pieces at you like the dewalts do.
As far as grinders go, Hilti makes the most powerful grinder in 4 1/2" it costs $240 at Home Depot and puts my Milwaukee to shame, less vibration and all power!