I have owned a couple of Paras...if I had it to do again I go with STI for sure. Metalurgy in the paras leave a lot to be desired.
Are you going to shoot competition? If so for USPSA I's go STI and shoot limited. If IDPA, I'd go with a good .45 single stack.
If no competition shooting, I'd also go SS .45. Much easier to carry concealed and more shootable than a double stack. Just mt 2 cents.