I have a Bugaboo Buffalo at the mo and LOVE it! Definitely not the lightest to lift but a dream to push, deals with 'off-road' really well, and our tall daughter has plenty of room in (and the carrycot was really roomy too).
Now going to get a donkey; they push as well, and they are apparently the narrowest double (not sure how true that it!)
Oh and I have a Cybex Cloud Q too - dd just moving into next size up (we have one Cybex Sirona M2 and one Nuna Reno plus). I do rate the Cloud Q, even though it took me ages to work out the recline! It doesn't lie flat in the car (some clever gizmo stops it) but does on the pushchair (fits on the Buffalo with maxi-cosi adapters). We have the isofix base but it is pretty sturdy with just the seatbelt too.