Unless you have the ventilation to keep it cool in there Id go with a T5 fixture, and supplement with cfls on the side..
A T5 fixture, and supplement cfls on the sides will grow u some buds
but dont expect the yield to be much
you said your closet is 10 feet high,
you want to take advantage of this and grow some nice sized plants that will yield for you when all's said n dun.
T5 fixtures and cfls do not penetrate the light past the canopy very well,
you have to keep the lights very close to the plants.
Tall plants grown with T5 fixtures and cfls are a nightmare,
they will yield far less than plants grown under a single HPS giving you at least 50w a square foot.
T5 fixtures and cfls are better suited for seedlings/clones and vegging.
if you have got good ventilation i would definately go with an HPS setup
may cost a little more $ but it will be well worth it in the end.
you will need some sort of ventilation with either light setup you choose
so why not just make sure it good enough for a HPS setup
a single 4" or 6" inline fan mite be enough for the ventilation
you could have the in-take passive
or use a fan the same size or slightly smaller its up to you
Peace G.G.