Basic 1885 will have straight stock, glossy finish, rubber recoil pad, iron sights (no tang). Traditional Hunter will have oil-finish stock, metal crescent butt plate, probably tang sight. BPCR is as described above.
Trad Hunter and BPCR are usually priced higher. Basic 1885 was made over a longer period and is not uncommon (most of their fancy "commemorative" editions were 1885s in 45-70; you'll see a lot of them ... at fairly high prices because of the engraving, etc.). If the gun you're looking at is in good shape, that's a good price. On the other hand, if you're hot for an 1885 in 45-70, that's the one caliber a few other makers (like Uberti) make a reproduction model in ... and they're usually cheaper than the Browning (take a look at GunsAmerica: do a "Search" under "all brands", using Keyword "1885").