I too have very large fingers and hands, in fact all of my buddies call me "manhands". I had a 72xx (about the size of the 8700) and the first time I used it, it shot across my office. Recently I switched to a 7100g because I like carrying around the smaller form factor. Bottom line is neither fit my handsize, but I managed to use each of them on a daily basis.
What I really need is for someone to figure a way to get a full size PC keyboard attached to my BB.