I've been pricing PCs lately, too. at Hellolights.com, I figured I could wire the lights, including ballasts, end caps, lights,clips, and power cords for $198.62. That's not Icecap ballasts, but they are designed for 2 55watt PCs, so for 4 PCs, you'd need 2 ballasts; however, at $28.95 each, that's still roughly a third the cost of IceCap ballast, and as best I remember these ballasts have three year warranties. The bulbs are 21" each, I think, so for a 55 gallon tank I figure one actinic and one daylight over each opening in the tank should suffice for soft corals/anemones. I've done some considerable research and most people tend to agree that 4 55w PCs shoudl suffice for what I'm wanting. I'm not sure if you use one IceCap ballast if you have to turn them all on/off at the same time or not (but I would imagine you do), so I wanted seperate ballasts so I could do 2 hours of actinic, then 8 hours of actinic/daylight, then finish the day with two more hours of actinic. It's something worth checking into if you're thinking about building your own canopy
~Michael