Here's a breakdown of what I've spent so far. This will become useful in a week or two after I've let everything run for a bit and then I can compare apples to apples.

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Antminer S5 build:  

5 Antminer S5 @ $449.99ea = $2,249.95     (I bought these on Amazon. I know I can get it cheaper, but this was state-side and easy.)
5 Corsair CX750M power supplies @ $79.99ea = $399.95
Total: $2,649.90

Expected Specs:

6,500 GH/s @ 590W (Edited)
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SDTech SP20 build:

3 Spondoolies Tech SP20 = $1,195.00
3 EVGA SuperNOVA 1300G2 @ $169ea = $507.00
Total: $1,702

Expected Specs:

4,800 GH/s @ 1,200W (Edited)
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For arguments sake, let's assume power costs $0.05 kwh.

I'm going to factor all this together and see where it lands. (I'm still trying to get my excel sheet to work correctly.) Right now it looks kinda like a toss-up.