While I like DeWalt tools in general, I'm not a huge fan of their drills- I've used several 18V (are they also NiMH? I think the XRPs might be), and they had some quirks with the gear selectors, and were heavy working on a ladder or on my back. I used a 3/8" corded briefly, but it self destructed running a spade bit through 2x4s.
I've got some Ryobi corded tools as well which I am pleased with (miter saw and 4.5" grinder), but not used any of their cordless tools. Their drill/driver combo comes with the smaller LI batteries, while I would prefer the fullsize batts- an additional $200. Durability is questionable, depending on who you ask.
The Milwaukee seems to be a good unit, and gets good reviews (the BIL said his set is great, except for the sawzall, which he said was worthless for cutting black iron pipe, lacking guts), and we abused their Holehawg drills and worm-drive saws horribly when I worked for a tile and terrazzo firm (converting worm-drive saws for wet stone-cutting, mixing mortar and terrazzo with the drills). It's one of the more expensive pairings, but I was impressed by the abuse their other tools withstood.
I've read that the current Craftsman line are Ryobis (haven't confirmed, but wouldn't be surprised), and I've got a 14.4V drill that has flaky batteries. One of the more affordable units, but slightly higher voltage (19.2, IIRC). Same ability to use a variety of tools as the Ryobis, although I don't know if Ryobi tools can use Craftsman batts and vice versa. Not terribly impressed with my buddy's drill, which is newer, and apparently different than my Craftsman drill. My Hitachi (which belches smoke, and is about 6 yrs old now) still beats on it.
I don't have easy access to the Snap On guy anymore, and have zero experience with anything but their hand tools. I've used Makita corded tools, but not cordless. I've not heard any complaints regarding their tools, and liked what I've used. They've dropped the price on their pairing to around $200, IIRC, although there are no additional tools available that I've seen. Not a deal breaker, but something to consider.
One thing that bothers me is the lack of specs offered for most tools. I care greatly about runtime, inch lbs, and charge times, and not much at all about ad copy. With my current drills, I can drain a battery faster than I can charge one- on the days I've really used them, I wind up standing around waiting- not good at all.
Ridgid also has some tools, but I noticed my Ridgid vac is identical to a Craftsman vac- I suppose power tools are like most things- dozens of brands from only a few manufacturers. Best rating on the impact driver (~130 ft/lbs, I believe), but if it's really just a rebadged [insert brand], I don't see a point in paying a premium.
Yeah, I really geek out on things like this, but I've never regretted researching a purchase, while I've paid for impulse buys by buying the same things again. Looking for some feedback from other users, and it seemed logical to ask around here, seeing as this is a pretty hands-on bunch. Thanks, and keep it coming.