I have a walther p99 in .40 S&W right now. Im looking to get rid of it because it gives me blisters. I dont have that much money right now, $100 only, and Im really interested in the XD9. I bought the walther for $515 and they are only offering me $350. Can i just have some input or suggestions and tell me how you like your XD. Im really thnking it will be what ill get when i trade in or sell my P99. Also, should i get the 357 sig or .40 and then get a 9mm barrel? Is that possible? If so which caliber should i start out with. Id like to try the 357 sig. thanks.