Just been taking a look at the pictured Paketa components. Most of it looks nice, except the wheels which I think are a bit marginal for tandem use.

A dream bike would be a Calfee with Lightning cranksets, Edge 68mm clincher wheels and then your choice of high end groupset (Campy / Shimano) and fit components (Thomson / 3T / whatever). I think it would be very nice and will get one when the kids are grown up enough that my wife and I can get out together on it regularly.

Currently use our Trek T2000 aluminium tandem with lots of modifications. It works nicely but obviously an upgrade would be nice.