Thanks. I've checked out many sites, used the Wrench Science calculator (seems geared toward racing bikes) and read a lot of posts.
I've narrowed it down to two sizes, what I'm having trouble with is how Kona messures its frames. I wrote to Kona and asked how they messured, c-c or c-t. They wrote back and told me that their 58cm is really 53 c-t and the 60 is 55 c-t. Some how the effective top tube is supposed to corilate in size with top tubes of real 58 and 60cm frames. Which leads me to look at the Kona diagram posted above and scratch my head in confusion. Is the effective top tube messured from the middle of the seat post to the middle of the intersection of the top tube and head tube as I have seen in every other frame I have looked at, or is it messured from the back of the seat post to the point where the top tube meets the head tube. I'm very confused.
I hope all of you appreciate the bike shops in your area where you can buy a bike trying it first!