70 or 150 would be my choice but then I am running 250 on 25 Gal.
You would probably run hot so you might have to get a chiller so another $300 
With pc you are limited and T5 you are 24" for the smallest so MH is your best bet. My two cents.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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