Tank size - Suggestions

[Norstar]

I am looking at getting a new tank. I am switching over from fresh to salt - so I need a little advice.

The tank will be 96" long (8 feet) and 30" wide. My dilema is the height. I know 24" is standard, but would 30" be too high (at twice the cost of the 24" high tank) ? Would I have to get extra lighting for the extra 6" ?? Any drawbacks to a 30" tank?

What to do - what to do?!?!!?! HElp!