Just a quick "Thanks" to everyone for sharing your thoughts with me. It's always nice when other experienced shooters weigh in. Someone will usually give me something to think about that I haven't considered or be more than happy to point out if I'm about to do something dumb.
Here's a snapshot of what the feedback looked like:
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That distills down to this for recommendation count & chambering:
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It definitely looks like the quarter bores are the favorite! For left-handers, the Ruger MkII in stainless with a laminate stock & a 24" barrel is something that comes up rarely but I have seen them. They never go "cheap" but the price usually isn't too ridiculous. LH Sako's in 25-06 appear occasionally with 22" barrels. There are plenty of 257 Weatherby's to be had that all come with a 26" barrel.
One other option I have is that I own three 30-06's so my Remington 700 BDL with a Timney trigger would be easy to rebarrel if I wanted to downsize it. This would give me the option of picking an optimal twist rate if I was so inclined. Lots of options to ponder over!