You def. want more head room. you can always lst your plants but you will want the extra room up top for flowering. And going cheep on lighting will give you cheep results. the only advice i can give is get the most lumens you can with what ever you choose to use. everything else is pretty much covered in here. Im assuming you know which bulbs to buy, blue spec. for veg, red spec for flower, other then that its preference and what fits/works. CFLs are cheap and produce very very little heat, in a small cab there a must.