Builing Veg Box, (Only CFLs) vs. (MH + CFLs)

Hi all, I have a closet that I am putting a vegetative box and a flowering box in. The closet is 5' x 4.5' x 9'. I am putting a 2' x 2' x 4' veg box and a 4.5' x 2' x 6' flowering box in the closet. I started building the veg box last night and went to look at CFLs for the grow. I have a 400W HPS that I am going to use for the flower box along with some extra CFLs for good measure. I was originally planning to use only CFLs for the veg box, but after looking around I am thinking maybe I should get a 250W MH from HTG Supply - http://www.htgsupply.com/viewproduct.asp?productID=48007 . What do you guys think? Should I just get a lot of the 26 or 42W CFLs or this MH and a few CFLs? I read somewhere that using a MH for veg instead of just CFLs would make the buds more dense in flowering, is this true? Also, the smell only comes with the flowering, correct? I want to make sure I do not have to filter smell for the Veg box.

Also, how much extra heat would this MH make for the room? I am planning on venting the Veg chamber with a speed controlled 120mm 90CFM PC Fan. Will this be enough if I also use the MH or should I increase it to 2 of these PC Fans?

Thanks for any help.

Bump, anyone?

look into t5's for the veg box. 2 hid lamps and ballasts are going to make that closett pretty hot. and smell can happen during veg over time. differs from strain to strain.

Thanks for the advice! I went ahead about bought the 250W MH, hope it works out well.