BTW, I know you are gonna get that dude on this thread who says the handgun forum is looking for a few good handgunners. Problem is that board hasn't reached critical mass yet.
Price on your possible BHP is pretty good, assuming the mags are high caps and the gun is in nice condition.
Mec-Gar makes good mags. Price on them is around $30, when you can find them. Genuine Browning mags are somewhere around $50 now.
The KDM (or is it KDF, something like that) mags that are marketed as either South African or Argie are good too, although a bitch to load. They are only $20 at CDNN.
I have never known someone to buy a BHP and be sorry. I have a pair, and although I am not a big 9mm fan these guns get shot a lot, because (a) they are great guns, and (b) 9mm is a lot cheaper than .45.