I've owned Para's, Sigs, Glocks, and HK.
I've still got my HKs and Glocks.. I really liked the M&P. Stay far away from Berettas, RUN from the Ruger SR9.
The SIGs, M&P, Glock 17, HK (P30, USP, P7) are all top shelf and will serve you well. What it ultimately comes down to, is which one feels...