Scott -
I had the same dilemma as you. I was tired of riding my old racing-style bike on measurements. Riding all hunched over was uncomfortable, but I had been using the bike for 10 years and was used to it. I was not sure how much longer I would be measuring.
I bit the bullet and bought a bike with twist-grip shifters and an upright riding posture. Spent an extra $25 on a nice cushy seat. That was 15 years ago.
Get the new bike. You will not be sorry.