As for multipool, I've seen complaints that poolpicker is way off on that one. Let us know how it goes
If you're in batch 1, you should be getting your S3's soon. Very exciting. I'll bet there will be a bunch of new threads soon around set up, tuning, etc. The people on the discussion and support thread can barely contain themselves.
The revenue-per power unit angle sounds interesting.
If I go with multipool.us (and the requisite Cryptsy auto-sell set up), I'll gather the numbers and either post them here or send them to you. Maybe I'll point one unit at multipool.us and the other at a straight BTC pool as a mini suchmoon experiment.