Hi,
you want a stiff frame. Your frames is going to be so big; that many bikes will
just wimp out because the long tubes won't be able to resist bending when you drop the hammer. Which really, really sucks.. I suggest you look at used bikes, even with your budget. Bikes that jump to mind would be Paramount, Waterford, Cannondale (especially one of their touring models), and Klein, and the Lemond Zurich.