If you want a Maxabeam, hold out for a true Generation3 version. Nearly double the Candle Power - in the 12,000,000 range. With all your other high performance HID purchases being new lights, why would you buy a used Maxabeam?
Gen2's are in the 6,000,000 to 7,000,000 CP range. They run at about 75 Watts and have the old style reflector and bulb. Gen3's run at about 85 watts, have a new reflector design and a better bulb.
Normally, a thread posted here with an eBay auction notice would be deleted without comment; however I'm leaving it visible (but closed) as the follow-up posts contain good advice.
My personal advice would be not to buy big-ticket items on eBay.