Sorry, just saw this, we were on another Viking Cruise, lol.
Not sure who may have bought them out by now (hasn't every company seemingly been bought out over the last 30 years?) but my Beeman R8 .177 is a beauty, both physically and accuracy-wise. Although its only around 800 fps, it is a single hole group shooter at 10 meters (international air gun competition distance (or at least it used to be.) One shot one kill on squirrels, (or so I have been told.) Incidentally, Meps Lure Co. still pays for squirrel tails (or so I have been told.)
Diana, Feinwerkbrau and even Asnschutz also made or make fine air guns. However since I got into firearms and away from air guns, the best and most accurate air guns seem to be those with a rechargeable tank cylinder to provide constant fps. Spring air guns come close, the but pneumatic pump up guns made by Crosman, Daisy and yes, even Benjamin, do not provide the incredibly contant fps. CO2 powered guns, fall off dramatically after reaching half of their potential per cartridge. but some monitor the air pressure so precisely that they will automatically purge when they can no longer provide the same pressure.