Depends what your primary race is, the way I see it the doable range for the nike spikes are:
Dragonfly's: 10k-1500 (i've used them for a few 800s and they've been good there too)
Victory's: 5k-800 (at their best they are probably mile/800 but can go down to 400s)
Maxflys: 100m-400m (can maybe go up to 800 if you are more of a 400 guy than an 800 guy but that is as far as I would take them)
So in other words, depends on the type of runner you are, if you are ever going to be in a 1500 or even a 1200 leg of a dmr I would go with the victories (or your dragonflys you already have), but if you are a guy who is going to be running 800, 600, and 4x4s the maxflys will probably serve you better than the dragonfly's.