I'm still partial to the 'optimized' Cannondale 3.0 Frame.

Stiffest frame ever on the Bicycling Mag 'tarantula' test jig.

http://allcdale.com/cannondale-30

The funny thing is everyone seems to complain about oversize aluminum frames being too 'stiff' and over the years Cannondale has engineered additional concessions into their framesets.

However, with carbon fiber forks, carbon fiber handlebars, and carbon fiber seatposts isn't it time to reconsider the old notions of what is 'too stiff' and what is just plain inefficient in terms of pedaling? All I know is that when I pedal the old C'dale is a rocket.

I bought a Giant OCR1 w/Ultegra 9 speed STI stuff hanging on it. I'm just not impressed. Nothing compares to my Cannondale 3.0.

I still think an early Cannondale frame is almost impossible to beat from a performance perspective. To the 'steel is real' crowd I always wondered how fast they would be on a bike that wasn't wasting so much wattage due to a wriggly frame and loosey goosey bottom bracket?