Sound advice from Dig. I bought a beautiful sidelock with replacement barrels from a member here a few months back. The mating to the action looks perfect, the gun fits me extremely well (the kind of fit that measurements can't convey)and overall looks quite lovely, actually beautiful!
And perhaps best of all, I shoot it really well.
So don't forget to factor in the real intent of the purchase; is it more for investment reasons or more for hunting/shooting? Nothing wrong either way. And once you have it in hand you might feel both masters are served, which sometimes happens with really nice guns.
Anyway, here's hoping you fall in love with it.