I started out as a hard core CFL guy. I got a taste of HPS and MH and I quickly switched. I use 600w MH earthgrow with 16 125w 6500k CFL's to veg a 10x10, which handles roughly 60 plants in various stages, I flower with 6 600w HPS earthgrows and I use 32 125w CFL's for supplimental lighting to flower a 20x30, now those CFL's are a 50/50 blend of 2300k and 6500k, my nuggets are dense, but not rock hard.

I should also mention my setup is pure hydro.

I started small, one step at a time, and I suggest you do the same. As far as soft and spongy nuggets vs rock hard nuggets, its alot more than JUST lighting bro. Lighting has a fair bit to do with the final outcome, but not everything. Yes, what you have now should be just fine for a first grow, I could probably do a max of about 6 plants with that, maybe 8 depending on how often you rotate.