dang that's a great looking bike!
I'd say look for used deals on a Cannondale Capo (Look for the older version in all black or silver not the new junky parts version they sell now). They are really great frames. Super stiff but comfy at the same time. I found it on ebay for $450 shipped before I upgraded parts
Here was my old one (I sold it because it was a bit too big for me)