Had another thought on the subject of choices, I realise that certain groupsets are judged to be superior to others, but on road bikes there appears to be an increasing choice between higher spec 10 speed, such as Tiagra with 2 chainrings or (for example) Sora with 3. In other words 20 speeds as opposed to 27. I have Deore XT with 9 X 3, on my hybrid, but although I haven't so far, nor am I planning to ascend the Alps, I've only used the large chainring once so wondering if it's going to be superfluous on my next bike.
So, high spec gears with 2 chainrings, or lower spec and 3, one of which I probably won't use? I'm tempted to think Tiagra or 105 as opposed to Sora or 2300/2200.