Although I prefer T-5 type floros to CFL's in a small veg cab almost any floro will do as well or better than MH.
Even a 250w MH will give off multiple times the heat that double that wattage in any floro type will give.

As for odor,of course vegging plants are not as stinky as flowering but they do give off a "green" smell once they get any size to them.
It is not a strong odor though and can easily be covered with any odor neutralising spray or similar item without having to use a charcoal filter.

Hope this helps bud.