Do you need a variable speed model?  That is pretty hard to come by.

I use a 7' Porter Cable VS Polisher, which also has a 5/8" arbor, for stripping paint, wirebrushing, etc. I would think that may be more what you are looking for, as most 4 1/2" angle grinders are single speed and turn at 9,000 to 10,000 RPM.

I bought a 2-pack of Bosch 4 1/2" grinders at HD a few months ago, and so far they are great.  I am usually pretty careful with my tools, but for some reason I treat hammer-drills, Sawzalls, and angle grinders like rented mules.  They take a beating.  I have had a few over the years, and the only one that I was disappointed with was a DeWalt.  

My dad, who uses his more often and as abusively as I do, has a Makita "Industrial" model that is probably about 25 years old.  It still works great.

here this should be a good choice for your needs.  It is a discontinued model which is why the pricing is so low.
Craig

good deal JJ

I make my living as a Tile setter and have 2 dc 500's  and a DCG500 that I use with diamond cup wheels, and they are WORK horses.  Hilti makes a product much like Festool in that to most everyone who doesn't use them thinks they are way over priced but to those off us who do..... nothing else even comes close.

thanks Craig