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Easy choice: 1000DS. After riding your Speed Four, the 620 will feel like a dog. Actually, I've never ridden a 620 motor, but I did try a '98 900cc Duc (gotta be stronger than the 620, I'm guessing), and even that felt a bit sluggish compared to the YZF600R I was riding at the time. But I tried out a 1000DS Monster last fall, and was pretty impressed. Maybe not the top-end hit of my Yammie, but more powerful down low, and at least the equal (if not greater) in fun-factor as the I-4. I don't know how the 1000DS would match up against your Triumph, but I do know the 620 would be whooped.
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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