I've got a 250W DE (HQI) Giesemann Megachrome 13k Bulb. Good intensity and doesn't give you the unnatural blue look to the tank. It really is a nice crisp white without too much yellow and just enough blue. It is a good compromise. Used for about 3-4months before I switched to something else (I try a lot of different bulbs, lol). I really liked this bulb and it was my second one that I had tried. Bought from JL:
http://www.jlaquatics.com/phpstore/s...t_ID=lb-hg2513
$70 OBO