So we have the following prices for currently shipping ASICs...
Butterfly Labs Single - 50GH/s @ $2499.00 (BFLBLACKFRIDAY Discount 25% off price $1874.05)
Avalon 4 Module Unit - 85GH/s(?) @ BTC3.5 @ current Bitstamp price $1024 = $3584
ASICMiner Cube - 30GH/s @ BTC1.99 WTCR price @ Bitstamp price $1024 = $2037
Bitmain Antminer - 180GH/s @ Auction price of BTC4.5 = $4608
BFL - $49.98 per GH/s (BFLBLACKFRIDAY $37.48)
Avalon - $42.16 per GH/s
ASICMiner - $67.90 per GH/s
Bitmain - $25.60 per GH/s
Bitmain is clearly the best buy.
Please correct me if I've entered incorrect data.
Wow, your numbers are not at all current.
You can get Cubes for 0.78 BTC shipped in Group Buys here. Ant miners are going for 3 BTC right now, and I've seen as low as 2.4 BTC. And Avalon 200 GH/s units (several brands now) are shipping at 2.4 BTC (or less - I got mine for $1950 shipped, should arrive Mon or Tue). All of this right here under Group Buys - definitely worth keeping an eye out there. The best bang/buck seems to be the Avalon units right now, but electricity could bounce it to the Bitmain Antminer S1s, especially if you can get a good deal on the S1.