The choice of lighting is of course up to you but I had a 150W MH over a 20g nano in the summer and my tank would only raise 2 degrees on the hottest days without a fan (open top however).
6 T5HO fixtures will use 324 watts of power and a 2 x 150W MH fixture will use 300 watts so for a shallower tank such as 75 power consuption would be about the same. Plus the cost of replacing 6 bulbs every 8 months vs 2 bulbs every 12 months.
Both types of lighting are great and I currently use T5's so I'm not advocating one over the other but if a great deals comes your way on a MH fixture it may be worth considering.
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