the difficulty increases are no longer 18%/jump. Its closer to 14%/jump if you average the last 5 or so, and its visibly decreasing. (the network is no longer doubling every month - not sure if anyone noticed it now takes 7-10 weeks per doubling)
https://bitcoinwisdom.com/bitcoin/difficulty says its 18% but that usually drops after a week in the lead up to the next hike.
( Estimated Next Difficulty: 15,980,709,911 (+18.70%) )
I would pay 1BTC for an S3 - possibly up to 1.1BTC if it DELIVERS before the end of June.
I was originally thinking its going to be somewhere around 1.5 BTC, but now I am thinking it maybe even higher being this is batch 1 of the S3, and if the price was fixed to BTC, would drop slowly over the following months along with bigger drops as batch 2, 3 and 4 come out.