I bought a Serotta Concours this spring and love it! Serotta has different ti bikes, one stock and 3 custom bikes (price-wise the Concours is the middle of the 3 custom ones). I don't know what your price range is, but I'd definitely recommend looking at the Serottas if it's an option.

As far as the feel goes- I've ridden steel, carbon, and now ti. (My only significant aluminum experience is my mountain bike and given that the tires are so much wider I don't think it's fair to compare). I actually prefer steel or ti over carbon- something about the dampening of the carbon was almost numbing after a while.