Warmer months; CS9, 908 or 3913NL
Colder months; CS40, CS45, 4040PD or 4516-1
I have quite a few 3rd gen in my collection; two 3906s, three 5906s (factory adjustable sights), 1066, (FBI) 1076, 6904, 6906 and a 915.
I use the 3906s and 5906s primarily for training when I teach pistol and CCW...