1.47 BTC for a Prisma ASICMINER 1.4Th/s+ miner. Not so sure about that research 
Could I buy one today at that price?
Yes
Not exactly. You pay today but it's a pre-order to be delivered sometime in October. Having said that, I bought one too, MIGHT have a chance at ROI if difficulty growth is slowing. S4 - not so sure. Power consumption between Prisma/S3/S4 is similar, if Prisma specs are to be believed. Cost per GH/s is much lower for Prisma.
it's less than half price of an S4 and uses less electric, i'd rather take a chance with 1.47 vs. 3.2. One note, you do need a controller with the prisma, it sells for .069 BTC and can control up to 8 I believe.
You're not comparing apples to apples man, and now it annoys me a bit that you were insulting my research.
You probably should be comparing what you are buying to 3 S3's.