Thanks for all the info. I've checked out many sources, wheel builders, dealers, etc. Peter White was a very good site and he has an unusually large variety of rims available. However, there is no consensus from all about the best rim. MA3's are 20+mm width, the CR18's are 22mm, T217 or 221's are also 22mm. The Sun CR18's have mixed reviews, mostly negative or should I say less quality than Mavic. (Whether this is mostly hype or not seems impossible to tell.) Most think the MA3 will be OK, but a few say too weak for loaded touring or too narrow for 23mm tires. The current rims I have (which need replacing) are 22mm or so and both tires (35's and 23's) work fine. Peter White had T217 available and that may be the best, but it is over 2x the cost of the MA3 (Hey, it only hurts once.) So still not decided, but will make a move soon. Thanks again.