Peiper made almost all grades of shotguns from classic "just another Belgian clunker" farmers guns to some very nice doubles. I don't know whether anything approaching "Best" quality was ever sold under the Peiper name; perhaps others can comment on that.
If the price is right, I'd say you should focus on condition more than grade; at least in the US, Peipers don't bring much money in any grade, but in good shape they can be good shooters. Usual caveats about chamber length and barrel material/wall thickness apply, of course.
