If I were you, and if money really is no problem.... I would pick up either a mossberg 500 or remington 870 that is set up for turkey... Both of them sell turkey edition models, go that route, or just buy one and put a good choke on it and such.. Then I would buy a savage 220, which is a bolt action, rifled barrel, slug gun. If you want only one.... Then buy a remington or mossberg package deal.. You can find them where you buy both a rifled barrel, with cantilever scope mount, and you get your smoothbore barrel as well. Hope that helps.
-Jake