The AF1000's are no longer in production. I never liked them because they have a timeout feature that is supposed to prevent overheating which limits how much you can use them within a short period of time. The Martin Atomic 3000 strobes are better in so many ways and are very reasonable in price (around $375). I use them now almost exclusively.
I have a client who wants to sell 30 of the older dataflash (pre-af1000) fixtures and a controller if you are interested. Those are nice strobes and with that many you can make some nice array effects