Hands down go for TI
TI has an amazing ride. I personally have never seen "low end ti" so I would be highly skeptical of the quality, since it truly takes and artisan to weld a decent ti frame. Especially since some scary stories about the motobecane ti bicycles that are advertised on "Bikesdirect".
Check out
www.lynskey.com. He is the former maker of litespeed and really knows his ****.