Yeah Evee, I've got a lot written about Spiro. As far as estrogen, I know a lot of women take birth control pills with Spiro and it really reduces the body hair a lot. I don't have a problem with all-over body hair, and besides, contraceptives make me throw up.
As far as finasteride, I don't know. Spiro alone works great for me, but I think I remember reading something about finasteride that I didn't like. It is best to get prescriptions if at all possible. My problem is that most hormone doctors want to fix your insulin, treat PCOS, or they want to help you with fertility. I have no problem with those things, so they aren't interested in anything else I'm concerned about. So I order without the prescript.
Check out the 2 or 3 Spiro threads. If you have a lot of body hair, I think you ought to get checked for PCOS. The metformin they would prescribe with the Spiro (and likely, estrogen) would help a great deal with body hair. You will, however, need to treat your face with electrology, since hair there can be quite stubborn.