Which rifle to buy

[Cossack]

You're making the right choice in caliber, I think. I shoot one in Kimber, and while not inexpensive, it is fantastic.
Check out this sitetoo:
http://www.cz-usa.com/01.02.php
They advertise a left handed version in their Model 3 version at only $10 more (but it's in a short mag), see if they have what you want in one of their other models. They make an excellant product and it's a good guy.