If you don't reload, you should probably steer clear of the Ultra mag. I believe Remmington only offers one factory load for that round. I have a feeling that it wont be with us much longer. As for the other two, take your pick. They will both work great for almost everything. The '06 may be a little more versitile, but the 270 can shoot lighter factory rounds with a slightly flatter trajectory. With either one your choice of ammo is huge.