My first grow was entirely CF and FL.
2x75wCFL one blue one red
4xFl mounted vertically in the corners of the closet.
In about the same space as you have, I ended up with 4 happy skunks and 6.8oz. Not a huge yeild. But, the smoke was great. So CFL alone will work/if you have patience, they do take longer. I am on my 2nd grow now and have invested in
3x150 sodium chl in addition to all the cfl and fl. I would say get the cfl and add the MH or SC whenever you get the money.
You should check out you local home improvement stores for lighting, becuase you can get MH flood lights and the reg FL cheaper than ordering them.