BTW it is much more easy to light the 150g b/c its 48 inch so instead of buying two light you buy one long one and save money. I just got a 260watt 48 inch of for my 55 gallon of ebay for $100 which is cheap compared to buying 2 36" hoods that provide as much. So go with the 150g. BTW how much are you getting it for?, i am interested in one.
I agree with NOLAGT on this one. If you have the room for a 6' tank get it up there as wide and high as you can. That is why I bought my 225. I like 6' tanks better any day. Even for salt. $1,000 is allot of money and you could find a used tank deal if you hold out. I bought my 225 marine ready (tank, stand, lights, fish, sump, closed loop with pump, sand etc...) for $750.