This Brooks might be the thing!
So yesterday I did over 30 miles, which (while I know it's not huge) was the longest single-day total for me so far! I'm thinking the Brooks saddle is going to work out for me just fine; my lady bits aren't numb or sore after, and my sitbones are even doing pretty well. I did have some chafing in the butt-cheek area (between the butt and thigh) by the end, but I think that has to do with the yoga pants getting folded in there. It's weird with the Brooks; I started out wearing shorts over the yoga pants in order to provide extra padding for the sitbones, but took them off a mile down the road; the extra padding is actually LESS comfortable, especially in the crotch area.
Now I just need to investigate the chafing threads...I'm thinking I need to buy some proper bike shorts that DON'T have extra padding. The quest continues...but my butt is pretty happy! :D