Hi Don,
I've used Milwaukee, Hilti, and Bosch, but have the most experience with milwaukee.
For residential I really like the milwaukee eagle with the sds-7 chuck. It's light weight and easy to handle with one hand, but still handles the heavier bits when you need it to. It's easy to find repair shops who can fix the milwaukee.
Repair parts for the bosch are expensive. Needed a switch for one once and it cost over $300 on a drill that cost about $800 new. Smaller bosch drills hammer at a higher frequency that make them very hard on the ears, another plus for the milwaukee.
FWIW we just shelled our milwaukee 1 1/2" thunderbolt. The cost to repair is approximately the same as the cost of a new drill....but we're allready in too deep to quit now. Not good and this drill is only about two years old.
Good luck with whatever you choose.
GJ
