The Speedster is really pretty. (Knott, there's one built up at Counterbalance on the Burke, if you're feeling the pull to drool in person.)

I'm a little confused, though. The geometry chart shows a 535mm effective top tube on it, and that doesn't seem to solve your top tube length problems. Am I reading that right?

I really, really hope it works out for you. You've been way too frustrated for too long over all of this.