I went with this one PlantLighting | Plant Lighting Equipment | Plant Light power Packs | Starlite (the euro reflector with blv son-t) It cost considerably less in the shop (£58).

Very happy but that's just me get an MH or fluorescents for veg and switch to HPS for flowering, Also get one with a remote ballast because it can be placed outside the growroom to keep tempratures down.

Also a ventilation system is necessary those HIDs get hot I got a vents TT 2 speed inline fan and ducting for £35 and with 5 passive intakes it does the job keeping me at a stead 25c which is perfect.

Oh and go for a switchable ballast unless you use flourescents in veg else it's just a waste of money.

My little girls are loving it