Get the 7mm 08. I have shot both of them. The 7mm 08 kicks more, so says the energy chart, but I can hardly tell. The 08 however is a much better suited deer rifle. The .243 is a great little round, but just a touch on the small side. The 08 fills the niche for deer perfectly, which is why I hunt with one.

I have a browning a-bolt and am about to buy a Tikka T3 in the same caliber.
Andy