cfl's is like buying a hyundai, where a HID is more the equilvalent to a corvette.
either way your going to get where you want in the end,
lets say you do a grow with a bunch of cfl's once your plants start budding you will have to do something about the smell, at which point you can get a ozone generator, or a carbon filter and fan, So why not just get the fan up front, and get the HID light then you will be able to cool it, once they start smelling you can hook the carbon filter up to you inline fan. and your golden.
htgarden and supply has some good cheap stuff, I like HIDHUT.com better.
if you dont want to deal with cooling the lights, I might suggest buying some t5's although they do create a little heat, they penetrate a bit farther into the cannopy, combine that with a scrog, and you should have some decent results.
stealthhydro has some combo package for 189.00 bucks that roseman and purpdaddy have a good FAQ for, as well as quite a few others.
I havnt used it .. but they always get some nice looking plants,
my thoughts are if your going to take the risk of growing, grow big!