King - I've had the opportunity to compare a few 45s and 10s side by side and if you hot load the 10, she will rock ya. If you handload you can load it down to 40 S&W velocities and have a pretty good bowling pin or practical gun for those sports. One nice thing about the 40/10 is the selection of bullets that you can use in the semi-auto, although many were designed for use in the 38/40 revolvers or rifles - some are swcs that give you a nice wide metplat but can cycle through your action. Basically, you can take a 180 - 200 grain bullet and load it slow or fast and the 10 will serve many purposes. If you intend to load hot, then get yourself a set of heavy duty recoil springs (20-22 lbs) from Wolffe Springs in PA. If you intend to load light, then get some target springs (14-16 lb) from the same source and you can vary the recoil level of the 10 to your choice of sport or field use.
With the heavier bullets (180-200) you don't need to load hot and you do need either a compensator or ramped barrel. Just for the hay of it, if yo go with the 10mm, you can always get a 40 S&W barrel, then a 357 Sig barrel or, there is a 9x25 which is the 10 necked to 9mm and she's a hottie. I would go with a 1911 rather than the Para, not being familiar with interchangeability of barrels and choices for the Para, I know there is a lot of variability for the 1911. HTH. Mikey.