CFL's wattage on the package that's big is usually the comparsion to the incandescent version, based on how much light they output, you want to go by the actual used watts. a real 100w cfl would be real nice, go for the 42 watters(150w equiv).

The HID really don't cost too much to run, check this out
Power Consumption / Light Cost

that can help your exact cost.
oh yeah, and yes the 400w hps pulls 400watts.

CFL's did me good in veg stage. but i did decide on an hps for flowering because i want some decent buds. enough cfl's can get you great buds too.