thanks very much for your answers.

what's your opinion on Antminer S3 ? I am ordering one and I know it's not the latest but do you think it has a chance to get through next difficulty ?

what is the order of antminers, is S1 the oldest and S3 the newest ? which one is the most recent antminer and do you know the name of the next generation to come ?

I will order an S3 but my next one I will probably want more as I am starting to really like this.

Should I get one for scrypt because it seems more profitable, what's your opinion about this type of mining ?

Thank you very much again for answers