We need some more info!

How many plants are you planning on growing?
Do you want more plants with less yield per plant?
Do you want less plants with more yield per plant?

I got my grow light at InsideSun.com

There are also different kinds of light, HPS, MH, Flouros, ect.

With around 200 bucks for a light, I'd get an HPS. I think it would give you the most bang for your buck.