wah bro, u got a deep pocket leh....i wish i was born with a silver spoon too
as for a 3ft height, it will not be wise as u will have difficulty in maintaining in future. The MH will also not be able to penetrate and u will need atleast a 400watts. The best height will be either 2, 2.25 or 2.5ft
And also, a 2ft width is not a good choice. I feel marine tank should have a min 2.5ft width.....
if you have the space, a 3x3x2 will be nice. For SPS, it best to invest on a tunze controller rather than the 2x6060.
A TS24 will be nice...
my 2 cents