Hi Ray,
I'm not familiar with those exact models of Para and Sig, but if you know how to shoot them I would guess either could easily do around 2 - 3" (or better, depending on ammo) at 25 yards, they both manufacture very fine guns. The vast majority of Combat Pistol shooters (go to USPSA.ORG for more info) use 1911's. STI and SV are very popular. Para's (and others) offer high cap models. At first, they may seem a little big, but once you put a few hundred rounds through them, (about 1 practice session if you reload), (and I suggest if you can, to shoot outdoors) you will probably really get to like them. If you do like 1911's, and want to try some real fun, with people who I think are very friendly, try a combat pistol match. You will make a lot of new friends.
I just reread your post and noticed the Para is a 1911, and I don't know if the Sig is. Just a bit of info: the 1911 comes apart by removeing the grips, the safety, 2 pins, and the few remaining parts (maybe 6?) they just fall out, and are easy to put back in. I had a Sig 226 and there was no way I'd start fooling with the half dozen little springs and numerous small levers and parts. Also 1911 are VERY easy to clean. Burn some powder, and have some fun!