Thanks Brian. Call me if you're interested in buying ours. I think you know I've been after a 7kw unit or a multi-head.. ;) Cleveland isn't a very far drive and it's a lot cheaper than paying truck freight :)
To clarify my original post, the ~$75/season operating cost is just for electric costs alone (in PA). That does not account for bulb amortization. Typical short-arc's used in these are good for ~500 hours before you start getting a decline in light output. I have 320 hours on mine now, so I can get away with another season before relamping.