I have owned all 4 rifles mentioned, the hw50 (actually it was a beeman R8, tuned), is ok but I reached for the r7 more often than not, as the size makes it handier, and being that it was used for short to medium range it did great. (by the way, i had 3 R7, and the best was the .20 cal.). I onwed 3 R9 in .20 cal... still own the last (actually a HW95 )... a lot more power than a hw50, and also very close on size... that is why the hw 50 stopped making sense to me. I had a 97K in .20 tuned, great FT gun, and i had the chance to shoot a HW97K blue laminate in .22... great guns. picking off shotgun shells at 50 yards was a joke... but sold the 97 and got a 77k instead, in .177 and had it tuned down to 11.88 fpe... it is my current FT rig... I just liked the classic styling better and it also still has the option of open sights... My gun has a Venom Clone kit and it will shoot well under 1 inch at 50 yards... is it more accurate than the break barrels??? not necessarily. it just looks better, and it makes me feel as if it more solid... that is why i like underlevers... The R1...BY far the best springer available... it is an understressed system that uses its own mass to smooth the firing cycle... and your body sway. I have owned a .177, a .22 and a .30 caliber R1. I have also shot them in .25 and .20... spring or gas rammed... They are absolutely wonderful. It you buy one new it WILL smooth out with time... but if you have a tuned one... that will be the last springer you buy. My favorite was a HW80 .22 carbine with a bull barrel and a target stock tuned to shoot 22 fpe. It had less recoil than the R7... but it was a wonderfully sorted gun. If you get one i would recommend a .22 because your only expense then would be pellets... It has enough power to hunt pretty big game (I did raccoons out to 40 yards with fusebox hits) and .22 is easier to get than .20... also it is very forgiving to shoot allowing for pretty amazing accuracy specially when stretching out... It is quite a handful as a backyard pester, but it can do it. The hw50 cant do the R1 job out past 40 yards... the r9 and the hw97 have about the same power... being in between the R1 and the hw50... But again, you can always dial the hw80/r1 down... and they get sweeter and sweeter.
Was the 77K excluded for any reason?