Rabbani - The V110 is a modified V70se to add a higher (switchable) plate voltage to the output tubes. I've had the V40 - V70se and V110 in my home. With each step up you get a little more 'control' of the music. The V80 is a different beast. It has much better transformers and uses a lower gain input and driver/inverter tubes. I have not had the V80 in my home.
Octave is great match for Dynaudio's. But I will say the TS KT120 tube is a disappointment at least for me. Too bright in the highs and a little too forward in the mids (after break in). Put warmer or more laid back input and driver tubes and the KT120 sounds better to me.
To me the V70se and the V110 are very similar with more control going to the V110. Agsin the V110 does have a switch on the back in case you want to run KT88's or 6550's.