well I love pistols and how a few here and there.  You mentioned a carry permit are you looking to carry this around 24/7.  If so the full sized USP or any full size pistol wouldn’t be my first choice.
Things to consider:
- what you are using the pistol for, ie carry or target
 - as far as caliber selection what can you shoot accurately
 
If you are interested in going to a range or other legal place to shoot I have a small arsenal. Including a .40cal Glock 23