Sounds like you already have it figured out. The 22.250 will give you more distance, but not if you don't practice and get the right scope. If you are not going to be shooting farther than 250-300 yards the 223 will be just fine. If you are going to shooting farther than that, be ready to spend some money on a lot of practice ammo! I chose the .223 for just those reasons.

The Remington SPS is a great gun. A trigger job and you will be ready to go. If you are going to get the heavy barrel, but careful for what you wish for. It is heavy!