I've got both the Rigid and Ryobi 18v hammer drills. I would recommend either one, although for different reasons.
Rigid Pros:
pretty beefy - should be similar to the "higher end" drill/drivers in power & torque
quick charging is nice, although I haven't had much opportunity to enjoy it because it takes quite a while to run the battery out at the rate I've been using it
If you get the set, their 18v circular saw is really handy too
Free battery replacements for life!!! (if you buy it quick - and don't lose the receipt!)
Rigid Cons:
It's a bit heavy (although the vanilla/non-hammer verision is lightier, I think)
noticeably more expensive than the Ryobi
The charger has a moderately noisy fan in it, which activates whenever you have a battery in the charger (even after the charge cycle completes). I think they needed extra cooling to do the quick-charge thing without cooking the batteries. Not a huge problem, but sometimes annoying.
keyless chuck is a bit finicky at times - easy to get bits misalligned (not a problem if you keep a quick-change bit holder in it and don't need to switch to standard drill bits often - makes it nice to have multiple cordless drills !
Ryobi Pros:
lighter - makes a difference when you're up on a ladder...
cheaper - excellent "bang for the buck"
18v drill/driver is pretty strong - somewhat less torquey than the rigid but still a big improvement over any less-than-18v cordless stuff I've used (had and was happy with the vanilla version before it got stolen - good with or without the hammer option)
gimmicky little bubble levels actually come in handy for keeping things accurate and alligned - especially if you only get to use power tools in your free time
gimmicky little magnet tray at bottom of handle also comes in handy
18v flash is really useful - pretty easy to set on flat surface and adjust to hit where you're working (haven't tried Rigid light yet)
Ryobi cons:
not quite as tough or powerful as Rigid
charge cycle takes longer
battery life is pretty good, although if I had to pick I'd say the Rigid gets more use per charge (but that's a rather tentatice observation - could change as I use them more)
no lifetime warranty
18v circular saw is still convenient, but a bit flimsy
was underwhelmed by most of the other 18v Ryobi stuff I had a chance to try (jigsaw, recipricating saw, vacuum) - for anything but really light work it was usually so frustrating I'd give up and go get an extension cord to use the "real" tools - BUT the drill and flashlight are great, circular saw is pretty good.
Hope this helps!
- james
p.s. - if you're planning on doing lots of drywall, may I also add that the DuraSpin rocks! I've got the cheap corded version and it almost makes it fun to hang drywall - almost...