You didn't say if you have just the action or already have an '06. If you already have a good barrel on your action chambered for the 30/06, why not just rechamber it? A good 'smith in your area should already have the AI reamer. That would be by far the simplest and least expensive way to go. Give a couple of them a call to see if they do that kind of work and if so, get some referrals. Call the people they have done work for and you should be able to get some good info.
The folks over at SST have several links to top quality barrel makers at their site: http://benchrest.com/sst/#barrels . I would look through there, maybe check Brownells (they have a good supply of the Douglas barrels). I'm not really sure how everybody else feels, but if you are going for a new barrel on your hunting rifle (not bench rest competition or anything), Douglas is probably hard to beat, especially at their price. Shilen, Hart, Lilja, McGowen and others are outstanding but a little more expensive, at least in my experience. You can't go wrong with any of them, just depends on the spare change you have. <!--emo&--><img src="http://beartoothbullets.com/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=''><!--endemo-->
Alyeska338 gave good advice! I certainly second the vote for Douglas, I think they are the best bargain out there. But if I were intent on spending more and wanted to be sure of getting my money's worth I think I would get a Hart barrel. I base this on very limited observations at our local shooting range. I have not seen anyone bring out a Hart-barrelled rifle that shot less than wonderfully, but I HAVE seen guns made up with barrels from other well known makers that didn't shoot any better than my factory-barrelled rifles. None really shot badly, though. I think all the makers Alyeska mentioned make good quality barrels.
The deciding factor is probably the gunsmith! You could take the nicest barrel in the world, screw it on crooked, chamber it out of alignment with the bore and set the headspace wrong and it likely won't shoot worth a darn. Unfortunately, I have no recommendations of national 'smiths, only having experience with local fellows. I would check out customers of your local gunsmiths and see their work first-hand. Good luck! ID
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