Me & a friend are considering to start mining bitcoins or litecoins and I have a few questions.

1) Should we go for Bitcoin or Litecoin mining? Bitcoin mining at least seems utterly unprofitable now, even though it was somewhere close to 20.000USD/month about 3 months ago.

2) What should we expect to earn (within the first 3 months, and/or the first year) if we invest up to 4000 USD on our first Batch of ASIC Miners? I don't need to take electricity costs into account as I pay a flat rate for electricity in my home.

3) Are there any companies/products that are particularly recommendable?

Thanks in advance for any advice.