Calvin, what are the dimensions o f the tank you are trying to light? The XR-E is plenty up to 24" with optics. 40 degree optics will probably put you between 250 watt and 400 watt metal halide PAR. I'm actually going to do some PAR testing when I have the array up and running so that will give us all some real numbers to look at.
As for heatsinks, eBay can be good for all sorts. Mine were definitely not from any computer. I am using three that are 12 inches by 15 inches and weigh 15 to 20 pounds each. they were industrial heatsinks of some sort. Lots of industrial heatsinks show up on eBay which is what I was looking for. You can find large heatsinks for any application on eBay, especially if you don't care how pretty they are. I was more concerned with size and functionality as they won't be visible in the housing. If they will be exposed and you want them to look nicer then Heatsink USA is a better, albeit more costly, option.
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