RE: turkey guns
Kamil, keep reading and doing a search on tueky gun advice. At the end of the day its really up to you what you are comfortable with, and what you want to pay.
Bottom line, which you have already heard is, WHATEVER you get, try a few different chokes and shell brands and pellet sizes, it will be fun and every educating.
You'll get the same gun, same choke, same brand of shell, one with #4's and one with #5's and one will be great and one might be terrible. On the other hand they both might work well. Even more interesting is that I can go buy the same gun, choke and shells that you have and get different results.
It's a very educating experience.
At the end of the day if you get something that works for you, stick with it and as you take birds you will build confidence with it.
Good luck and ask away on any other questions but there is a wealth of info on the web for chokes, how to pattern, etc.
Have fun!