That's awesome, I happen to be a Hygro lover myself! If its hygro species I want to grow it!
I love and prefer the scientist route for sure, its what the hobby is all about for myself. If cost is an issue I would check this link out: http://www.fishneedit.com/metal-halide.html
The 150w silver pendant is what I ended up picking up off craigslist for $60, plus 6500k bulbs I found for $20. The prices on that site are not bad at all and the quality of the thing when I got it and tore it apart is exceeded my expectations for sure. Yes, I am slightly MH biased