question 1.
A lot of debate whether you could make a profit or not I am not going to get into that part. 1600 euro seems a little high at least if you convert from us prices. Not sure if its with vat and customs for you or not. Cheapest I have seen is around 1750 us delivered.
2.
I mine on Multipool.us it does profit switching. I make about 7% more than just mining btc. It is more work however because i have to sell coins on cryptsy(or anywhere you want that handles that coin) to cash completely out.
3. No idea sorry I don't trust that link to install anything and i would suggest you don't either
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
No offense but I can't take chances on links.
Steve