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I don't know how tall you are, but the Duke is really tall, so that might make your decision easy. I've never ridden the Duke, but I've ridden the Triumph and it's an awesome bike. If I had the scratch to chuck down on a new bike it would be a Speed Triple. The Duke is sexy as well, but IMO the Triumph is an awesome value and still not a "me too" bike.
Went and checked out the speed triple yesterday. Thats the one. Gonna wait till the 08's though. Brembo's, New rims, inverted front forks, only $300 more.
I have an '05 Speed Triple and love it. All around good bike. Comfortable position, tons of useable power, and looks mean. I don't have the info in front of me but I know it also received bike of the year from a couple different magazines, including 2 years in a row, I believe, from Motorcyclist.
I was looking into the SuperDuke recently because it too has gotten so many good reviews, Id really like to ride one. But I'm pretty sure I'd be kicking myself if I got rid of the Triple.