Hey bmumford,
I am also in the market for a new all-around-good rifle and I have been pondering this same question.
http://www.snipercountry.com/Articles/AccuracyFacts.asp
This is a link to an article that I have read over a few times and, if you've plugged ".308 vs 30-06" into google before, it's usually at the top of the page. From what I can tell the .308 and .30-06 are virtually identical before 400-600 yards, after which the .308 tends to have an edge. My problem is that I'm in Kansas (for deer hunting it's really not a handicap
) and the land I hunt is an open corn and wheat field so it is not unlikely that I would have to take a shot at that point. I'm mostly leaning toward the .308, but that's mostly because I don't plan to start hand-loading ammunition--and I have been told that hand-loaded .30-06's can produce phenomenal results. If you're like me and want a consistent factory load I would go with the .308, but if you want to personally tailor your rounds to fit the job, I would go with the .30-06.