I may have a 175 watt MH available for you. If jung doesn't take it, I'll put you next on the list. It's a 175 watt 10,000k Ushio mogul base. Check out the thread marked F/S dry goods from chris288. I can't help you with a chiller, but I did build a DIY heat exchanger that may help. If youd like, I could send you the plans. It costs around $50 to build.
chris
I'll find out tonight if it is still available. It has never been used and is still in it's original package. If you're looking for used, I can give you a couple for free. I think they were used for 12 months. I think I have boxes for them too, I was going to use them to light a grow-out tank, but I cancelled that idea. I'll try to get back to you before 9:00 PM.
I have no new bulbs left, but I do have the used ones. you can have 'em if you want 'em, but I probably wouldn't use used bulbs. I'm sure the color has shifted by now and I can't say how long they'd last.