In reply to drolex:
I'd have thought that anything that gets you up a hill will be reasonably exposed to the wind, but here are a couple of ideas -
* over the back from Capel (the track up by the LMC hut) to the big reservoir then back over Pen Llithrig y Wrach or along the side (I don't know what the paths are like for the latter bit but up to the plateau behind Capel is lovely)
* Llyn Dinas to Pont Aberglaslyn and then back through the valley behind the copper mines
* Capel to Pen Llithrig y Wrach to Pen yr Helgi Du and back.
* Yr Aran via the Bwlch Cwm Llan from Rhyd Ddu
* Moel Eilio etc from Llanberis.