As 427 says, the R700 is a great action and the root of a huge majority of coustom rifles.
That said, the more recent R700's seem to be long throated(not conducive to accuracy and magazine lenghth limits how far out bullets can be seated) and the new version trigger begs to be repalced.
But of course, money matters.
Given a generous budget and a desire for a real tack driver, I would go for the R700 action, have it trued, rebarreled with your choice of barrel(Hart being a good choice), trigger replaced, and properly bedded in your choice of stock. There is an OKC area shop that does such work as reasonably as anywhere and their work is superb.
Otherwise, I would think more about the Savage 10 FCPSR. A buddy was shooting one the other day and I was impressed with the accutrigger(varmint)which could not have been over one pound and the overall rifle design was adequate. Accuracy with this particular rifle right out of the box was not impressive with factory ammo but that will likely change with proper handloads and breakin. this rifle was said to be factory bedded and barrel is floated but did not have a chance to look at the bedding. At $800 or less it will likely never be as accurate as the custom R700 but a lot cheaper.
And optics are really important and cheap optics are, well, cheap. Leupold has always seemed to be a good compromise in price and quality and the 6.5 X 20AO with target knobs is a favorite.
