My wife wants to get me a new gun for Christmas.
Welcome aboard!! But more importantly, what's your secret to having a wife that "wants" you to get a new gun??? Please share!!!

For current production Ultras, the stock is the only difference, older models had much nicer finishes on the frame and barrel, but that's not the case much any more.
You've got 2 choices in .223 Ultras, there's the 22" standard contour Ultra Hunter and the 24" bull barreled Ultra Varmint. The same options are available in the Handi, but the bull barrel is a 22" instead of 24". There's also a 20" Superlight barrel.
A hunstman barrel could be fitted to any of them IF they still make them, there's a possibility that they'll be discontinuing muzzleloader barrels next year, but that hasn't been confirmed yet.
Tim
http://hr1871.com/Firearms/Rifles/hunter.aspx