The Bigger The Better (know someone will have something to say about that)!
Really though! Once you get over the UGH bit and get your sea-legs...it's all plain sailing. We were in a Force 9 - will try and paste a photo tomorrow - but as everyone knows - it takes me a while!!!!!!!!!!!) You can get patches these days to stop the UGH bit.
I've sailed a bit - and found that the smaller yachts made me far more "dizzyUGH". That's how it was for me anyways.
TTHun - if you get the chance - so go for it. I'm sure you would never regret it. There is nothing more beautiful than the wind in the sails and dolphins swimming alongside the bow riding the waves.
Will really try and post some photos (can do that yeah?)