IF YOU'RE GOING T5:
Make sure you get the full spectrum if you get this. Hell, I'd spend the extra money and get 4 of each spectrum. But if money is a concern, just get the mixed spectrum and after your first grow, sell some and get $ for another set of 4 mixed spectrum.

IF YOU'RE GOING HPS: First, that site is a rip-off. Here's a better deal...
http://htgsupply.com/viewproduct.asp?productID=47994
If you want to just use HPS the entire grow, I know plenty of folks who've had good results like that. However, if cooling your light is a concern, I'd get this...
Sunlight Solutions Hydroponics Systems <--click products, the 400W is what I'm talking about.

I'm sorry I can't answer your question directly, so how about this? If I were you, and splitting the grow room into 2 different areas, I'd get some CFLs for the veg area, and the 250W HPS from the link I provided (I'd also opt for the Euro or the Cool Tube reflector). If I spent the extra cash on the reflector, I'd also invest in a 6" inline duct fan and a 6"-to-4" reducer, along with some 4" ducting. Hope it all works out and best of luck! -GG84