Prowl now, and again in 6 weeks will get you through for the most part.  After that and you still get crabgrass, you have Callisto which is Tenacity in Turf world, or you have Impact, which is Pylex in Turf world active ingredient topramezone.  Careful with those two, you will find out what your lawn is made of when all the warm season grass and weeds turn white.  Another is something like Drive75 which has quinclorac in it that's supposed to be pretty good.