purchased 250w MH, now what?

[marvinsae]

its 36" so should i go with the 2bulb 4 or 6...im thinking for the 2 bulb fixture its only about 150 and the 4 bulb is like 260...theres a big jump in price but however the 6 bulb is 300. so it's either the 2 bulb or 6 bulb possibly. so which one would suit my tank? also what type of bulbs should i purchase. and also i have my 250 watt pendant on the front if that matters