Wow, it's been some time since I did any sort of assessment on this, but have to agree that Girlpower would definitely be high on the list. We used to have a roster that was very deep in this department, including:
Angela
Biceps Ella
Queen Muscle
As we've expanded, one of the drawbacks is that we know less about the skill sets and specialties of most of the newer models, but just hop in and check them out. There's so much to choose from these days that we're sure you'll find someone who can adeptly provide what you're seeking.
She is not on often, but if you like the short-but-really-fucking-powerful type, check out Trinity.