I have an oppertunity to get a great buy on a sig p239 in either 357 sig or 40s&w. Is there a big difference in performance and recoil between 357sig and 40s&w? I have shot the 40s&w but not the 357sig. Other than the price difference between the two rounds can anybody help me decide which to go with. I realize the barrels can be swapped if I were to chose in the future but I guess I'm asking if the price difference for the 357 round is worth it. Also I have only been able to shoot the regular da/sa, any input on the DAK trigger? I liked the da/sa. This will eventually be a carry weapon primarily. Any help would be appreciated.