I recommend the T2000! My wife and I’ve been riding a T2000 since last August and have been very happy with the ride. My personal bike is an aluminum frame Bianchi Reparto Coarse Team and it has a much harsher ride than our T2000.
The Ultregra groupo with the XTR rear D is top notch and all you’ll ever need (unless you’ve got the big bucks budget).
You may have seen posts and treads I’ve started regarding “mushy” brakes and poor brake performance. Please take those whinny posts with a grain of salt, as I tend to be a malcontent when it comes to component performance and I tend to be hard to satisfy. I also tend to tinker with, and add gadgetry to my equipment. After talking with other tandem owners in addition to watching this forum, I’m fairly sure that the Avid brakes which come standard on the T2000 are no worse that what is available on other bikes.
BTW, my analysis of the mushy brakes revealed that cable stretch was the major cause of what I was dissatisfied with, and the fix was really quite simple.