Check out the Colt Defender too.
I love mine and carry it everyday. All 1911 models with 3 to 4 inch barrels have there share of probblems with feeding or ejecting, kind of like the R9. But the Colt Defender is known to be the most reliable.
If you won't a full size model any well known make will be very reliable. But once you shorten the barrel your choices diminish and maintenance doubles. The 3 inch barrel models your only real choice is Colt and you still mite have to do some tweaking to it.
For further study:
http://forums.1911forum.com/