Have raised power outlets so cordless not an absolute necessity.
Most hand drills made today are reversible, whether cordless or corded.
On corded drills, 1/2" drills generally are limited to 850 rpm while 3/8" units tops out between 2,100 & 2,800 rpm.
Cordless drills - minimum 18V, check top rpm of the drill units - most top out about 1,600 rpm. Li-ion battery.
Roto-brushes do not require much torque but may require higher rpm for nylon & horse hair units.
Corded drill wise, I like Milwaukee & Bosch.
Cordless unit - Makita, great ergonomic.
Dewalt seems to do a great job up and down their line. The big difference between a Dewalt and even a Black & Decker (owned by the same company) is that they use better materials so it will last longer. For example, a Dewalt will have metal gears inside instead of plastic, higher quality batteries if cordless (huge difference in battery life), metal bushings in the motor and be more durable all around. This is true when you compare it to others - especially the cheap Ryobis at Depot that look so good otherwise. Some brands make it really hard to tell like Craftsman in that they make cheap crappy ones and really high quality ones under the Craftsman name. Not easy to tell what is what unless you just blindly buy "the more expensive one" and hope it was the good one. Buy Dewalt and all that is out the window.
I fully expect to give my 5 year old son my Dewalt corded drill years from now. Perhaps my cordless makes it him as well.
Hope that helps.
cost wise i would look at the black & decker firestorm models, longevity wise definetely dewalt/ millwaukee / makita they're all contractor grade and cost more for a reason. But then again the crafstman comes with a lifetime warranty.
I was looking to replace my aging collection of cordless drills with a new Li-ion drill. I didn't need a huge 18V pro level monster so I did some research and ended up with a Hitachi DS 10DFL. It's 12V, pretty small and lightweight, more than enough power for all but the most demanding jobs, came with two batteries which recharge in something like 45 minutes. Two speed gearbox plus variable speed trigger. Adjustable clutch. All for about $65. Got rave reviews and so far it's been a winner.
Craftsman lifetime warranty is only on hand tools.