How many plants, and what size grow area? Those CFLs should give about the same results as the HPS in veg, unless you plan to veg more than 16-18". That's when they'll start stretching because of lack of light penetration, so the HPS would be a better option at that size.
With a reflector, each of those CFLs will cover a plant effectively, especially if you plan to keep then under 18" in veg. Without a reflector, you'll have to use two CFLs per plant, because alot of the light will be dispersed, and lost. Reflectors are REALLY worth the investment, trust me.