I personally don't own a Para 1911, but I have 3 friends who have them and have had plenty of trouble with them. They were extremely picky about feeding, and needed some serious tweaking to work right. A buddy of mine who is an excellent 1911 'smith said he won't work on Para guns because they are too hard to fix. He said the finish of the frames is way too rough, and this can contribute to reliability problems.
That being said, I think Para has made a lot of improvements in their manufacturing process and is currently making a pretty decent gun. I darn near bought a P14 LDA for duty, it felt so good in my hand and the trigger was sweeeeeeeet! I'd have preferred the single-action, but I can't carry one in uniform. I decided to go with the Glock 35 instead for a number of reasons, and have been very happy with it.
If you must have a double-stack .45, be prepared to carry a fairly large gun if you want more than 10 rounds. If you pack a standard 1911 with McCormick 8-round mags, you're only two rounds down with a much slimmer package. If you buy a Para or a Glock 21, be prepared to pay a premium for pre-ban hi-cap mags.
If magazine capacity and a decent-sized round are your major concerns, look at getting a .40. Without re-hashing old arguments about calibers, with a .40 you get plenty of power in a 9mm-sized frame. With a Glock and pre-ban magazines, you can have up to 15 of them in your sidearm. My G35 is almost exactly the same size as a government model 1911 (just a bit thicker), and with a Milt Sparks IWB holster it conceals darn near as well. I picked up a few pre-ban mags for it, and with one spare mag I've got 31 rounds of .40 ready to go. Great duty/concealed carry gun.
If you can get over your aversion to single actions, think about an STI gun. They are not that much thicker in feel than a standard 1911 due to the polymer grip frame, and they tend to be more reliable than the Para's (at least the old ones). A buddy of mine carries one daily- with two spare mags he's got 46 rounds of .45 on tap. Feeds anything he puts into it.