I personally like the Beretta Storm CX4 in 9mm for this purpose, but it is a little pricey, but not like AR15 9mm carbines. The CX4 takes Beretta 92 mags and so mags are plentiful and fairly inexpensive.
Of course, there are the .40 and .45 acp versions as well. They take their own mags, as I recall.
Note that some of the controls on the Storm can be reversed for handedness and preference (mag release and safety). They make rails for them if you want to add accessories.
The best bargain out there, IMHO, is the Hipoint 9mm carbine. They look a bit funny, but by golly they seem to shoot great and are reliable.
Of course, you could go with a Mechtech carbine upper to put on one of your pistols.