I'm not an "alumino-phile" either but that being said, my fastest bike (based on
PR's set on my local rides) is aluminum with carbon seat stays, a Wilier Alpe D'Huez. If I would generalize about aluminum, it's that the stiffness makes for an uncomfortable ride beyond 40 miles or so. I don't think that's as much of an issue though if you're using a carbon or steel fork. My general bias against aluminum comfort, although tempered somewhat by my Wilier, was set by my first real road bike, a Trek 1000, which was like being beat with a solid aluminum hammer every time rode it.
Enjoy!
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL