I've got two totas, a pro light, and a 300 watt fresnel. Coupled with some light modifiers, it can make things look really good. One thing I would reccomend is a couple umbrellas for the lights. They are cheap and can make things look real good quickly. Not ideal, but quick. I know that you have a budget, but get all you can. If that means only having two kits instead of four, then so be it. I've got all that crap in my car, but I might use it once a week. Establish a checkout system and enforce it and you will be fine.
The other thing you might look at, if you are using a frezzi system, I have my frezzi on a stand (3/8 stud). It is powered by an NP-1. This is a great solution to run and gun. I can adjust the intensity by moving the stand back and forth, adjust height, and if you place it like a normal light would be, in the reporter sandwhich method, it can make the average shot look tremendous compared to if you turned on the oncamera light on the same plane as the camera shoots.