If the viola is for a beginning student, especially one who may soon outgrow the instrument, don't get the most expensive viola (don't get the least expensive viola, either, as that may be an unworkable option), but consider getting the most expensive bow. Often, a quality bow (and strings) can make the instrument sound better than its price range. Upgrading the instrument’s bridge may also be a cost-effective option to help squeeze a slightly better sound out of your lower-end viola.