The 400 GH October delivery has a decent chance to make ROI at $20/GH, but I still think the 25 GH October delivery is absurdly overpriced at over $50/GH.
By October, I suspect you'll be able to get a Blade for under $50/GH given the recent ASICMiner price drops.
The $1300 is not just for the 25gh/s hashing board. It is also for a master board and a raspberry pi. You can add 15 additional hashing boards (16 in total including your first one that came with the starter kit) to 1 master board for $500 per hashing board (each 25gh/s).