Thanks to all respondents. Good insights. I wish there was a +1 button to easily say how much I appreciate your specific input without bloating the thread with separate messages of thanks. :-/
Definitely focused on fit first. Seatpost length being the current constraint given that in general that most frame stock sizes are too small for me. :S
Incidentally, we have a new Velodrome in Detroit (Lexus Velodrome — google it), which is what has spawned my interest in a track bike.
I was at the track for orientation / Track 101 on Saturday and 5 out of 20 people were needing 61cm rental bikes or larger and the track ran out. :-(
Me thinks it is time for manufacturers to do a better job gauging the “N-th percentile” — people are trending taller in the last 30 years especially.
Blame it on the growth hormones fed to dairy cows that we as kids ingested by proxy. ;-)