What are the differences in Tikka T3X rifles?

[The Lion Tamer.....]

I'm back on the Tikka train, I now am deciding on which caliber I will get, a .308 or .30-06 makes the most sense,as I can locate that ammo basically anywhere ,even way up North and I won't be hunting anything dangerous or in an area where I "need" a 9.3x62, though I do like odd calibers,I am leaning for .30-06 tonight but I am not sure exactly when I will actually buy the rifle,in the next month or so for sure.