I guess you would have to ask yourself a few questions~
Do you plan on staying in Production? If you do then you could consider Glock 17 or 34, XD 9 or M&P 9. They are the most common as far as I'v seen. If you think you might want to play in a couple divisions maybe production and limited you could go with a Glock 22 or 35 or a XDm 40. When you shoot production load to minor and when you shoot limited load to major and toss a mag well on.
My only other 2cents if the purchase of a new gun would put to big of a dent in your budget where you can't shoot a lot skip the new gun and get more rounds down range with the gun you have now.
Good luck and welcome to the best sport on the planet