A-bolt or X-bolt are about the same. I have the X-bolt now and love it but you could probably save some money on the A-bolt. I have had both and they are quality rifles.
I think you made a great choice on the rifle you want. I just want to point out one thing before you buy. The 300 WSM is the fastest growing big game caliber out there. In the rifles you have chosen, it is exactly 4 inches shorter than the 300 Win Mag and is close to the same in ballistics. That's why it is so popular.
You won't go wrong with the 300 Win Mag but I think you would like the 300 WSM much better.
Either way, you will be very happy.
Everyday should be Veterans Day! Thanks for your service!