I have 2 P07s, 2 P09s and 2 (maybe 3 after this weekend) P10Cs. One each P07 and P09 have been Cajunized as have both P10Cs. It really depends on personal preference as to what you should get. I prefer the P10Cs for carry because of the trigger feel. For range time, it's a toss up. Love the Cajunized P07 or P09 trigger but then again, I really like that tactile feel to the P10C trigger. My P09s are mainly used for HD as they are not as comfortable for carry for me.
You cannot really go wrong with any of them. The only caveat there is that you can run the P09 mags in a P10C (if later style) and P07, but you cannot run P10C or P07 mags in a P09, so you lose a bit of versatility with the larger guns.