Damn that's expensive...as mentioned, if you buy the components of this system separately you will save a shitload and not have to worry so much about yield. It will be easier to whether the storm without a hole in your pocket. Yield will vary as well...no way to predict unless you have already...
I think you get what you pay for. When you said "good" I thought you meant bang for the buck and reliability. No offence but the chinese made ballasts don't qualify as good in any way...just cheap. Solis tek, lumatek, and phantom are brands I would consider if I was looking for good.
Small space = COOL TUBE + extractor fan. Either way you will need a way to get rid of the heat whether you're going with cfls or the HPS. The better yield will come at a greater expense initially but it will be well worth going for the HPS light if you can.