For my money, even though I dont own one, I'd go with a Sig. I know several guys that have them. Everyone who owns one swears by it, and I trust the word of guys who depend on guns every day.
While I love my Para .40, I don't recommend it for someone who doesn't have a bit of tinkerer/gunsmith in them. It comes a bit rough on the feed ramp from the factory (at least with the loads I shoot), and needs to be broken down and have some "cleaning up" done on the lip of the ramp. It does have a great feel in the hand though, and Para's safety system is great.
Taurus is also a great gun, very solid and very reliable, and again a great safety system. I dont own any shell chuckers in this brand, but I've shot a few. They handle recoil well. A bit awkward in my hand, but I think the newer ones have fixed that.
Kimber was suggested, and they do incredible things with the .45. I'm sure they make a good .40 as well. I know a couple of guys with Kimber's, but they are hardcore competition nuts too. I do know their guns will take alot of abuse and still function.
However.
I would NOT recommend any modified 1911s. There are plenty out there with modified triggers, lighter springs, whatever. This gun is VERY good for what it was designed for. Killing people in combat situations. A new one (read "stock") is ok, and they are fun to shoot in target/competition situations. I would never suggest it as a carry gun for anyone unfamiliar with it. Used ones, buyer beware.