This speaker is not the best combination with tubes as it is low impedance (4 ohms) and low efficiency (86 db; their website claims a sensitivity of 89 db, but when you correct for the 4 ohm impedance and calculate for power rather than voltage the 86 db figure is correct).
So unless you have a small room you need a lot of power (200 watts or more) and tube power is expensive. However with the right amp I would expect it to be impressive- Dali makes very good loudspeakers.
Because you need some power, the larger VTL, Convergent, Atma-Sphere or possibly ARC amplifiers are the sort of thing you want to consider.
If you have a smaller room it might be a very different story... how big is your room and how lively is it?
