There's bikes out there for everyone. You'll have no problem getting one- the biek shops might not have the largest sizes in stock, but they can usually get em in a week.

Well, every person likes their fit slightly different. That, and the geometry between models is also slightly different. So it would be hard for me to give you a golden fit rule. The best way to get the right frame size (unless you are as tall as I am, then you pretty much get the largest size) is to get a professional fit. That will set you up on the right frame and get all of the other measurements in the ballpark. I did my own fit on the first bike I owned and it worked out OK. I had to buy some aftermarket things to make it fit right (stem, handlebars, seatpost). When I upgraded I had the fit down at my LBS and it turned out much better than the self fit. There were still a few minor adjustments I had to make, but it was very good in general. If you are looking to purchase a bike online, you should be aware that you may have to invest a bit more than the initial cost to get the fit correct for you. Also, you will not have the support that you would get from the LBS (many offer free tune ups to those who buy bikes from them). Just a few things to think about.