Best tire mounting and balancing machines?

[Enzeder]

I'm about to get a new set of tires, and wondered what the best machines 
are for mounting and balancing?  I know it's only on half of the equation, 
but it's a start.

The last time I got tires, I just went to Costco, but they gouged the 
wheels badly.  This time around I have a new set of wheels and would like 
to avoid a repeat.

Any one know of any good shops in the West or Northwest Baltimore area 
(Columbia, Westminster, White Marsh)?