At 247', Mirabella V is the world's largest single-masted sailboat. She can do 20 knots under sail: that lengthy waterline helps with boat speed.
Best of all, you can lease her, with crew, by the week - but it's a bit pricey for the average workin' stiff at $300,000 per week. Summers in the Med, winters in the Caribbean.
Details and great photos at Mirabella V.