Steel heavier? Not necessarily. My Kelly Bonestock in True Temper OX Platinum is stiffer, more responsive, snappier than my Litespeed Tuscany. It is almost identical in weight (and less than some other Ti frames I've seen) even though the Litespeed has lighter wheels and components. Deb is right though in that it doesn't absorb the road buzz as well.

The Kelly whips up hills and leaps forward under acceleration. The Litespeed absorbs road buzz far better. It rides like lugged steel from a road buzz view but without the weight and not as slow a response time.

It really comes down to the tubesets and how the builder manipulates the tubing and the geometry. Seven stocks so many different types of tubing in the different frame materials that they can really tune a ride. I'd love to see what they could do with Ti for the road buzz but a stiffer acceleration. Ti can get a little wimpy in large frames, but you don't need to worry about that. Have you looked at Roark? I seen some nice frames from them.

Bill's Seven steel/carbon is snappy fast and light. It is far too large for me to try, but I get the impression from him that it absorbs road buzz very well.