I'm kinda partial to really good brass, soooooo if it was me, I'd probably go with this little jewel from Lapua.
.30-06 Springfield (7,62x63)
Of course it would mean a little more work but then I really enjoy the reloading process no matter how extensive it may get. In the end you'd have the best brass you could get.
You can go the routes you mentioned, and the choice is ultimately up to you. Either way you'll end up with a pretty potent round.