I am thinking about upgrading from my 1991 bridgestone rb-1 to either of these two bikes. I rode the expert and it was nice: stiffer and a tad smoother than the old rb-1. I don't have an opportunity to ride the excalibur but the CC deal (1999) is super. I do have a marginal lower back and don't ride with a lot of drop from the saddle to bars. any suggestions would be appreciated. price for both would be about the same.