LOL. Reading this thread I note that not one reply directly addresses the content of your original post, "I have narrowed done my likes to 3 rifles. 1 Beeman QB Chief, 2 Benjamin Discovery, 3 Diana Stormrider. I would appreciate feedback on these three". Yes, you did also ask for other suggestions but first made it clear that the three listed rifles were your primary selections based on prior research. Hepotter even went so far as to tell you to forget PCPs and stick with spring-piston guns.
Here's my input: the three guns you do in fact prefer are generally well-regarded for low cost PCP-entry guns. You will of course have to factor in the cost of an air source so there's that. You've done research so I won't belabor that point. I am a Crosman fan so, from among your list, I'd say go the Disco route. A proven platform with tons of aftermarket support and mods, accurate all day long, and a lower fill point (2k psi) to ease the work of filling if done via a hand-pump. The QB Chief received good marks from reliable reviewers, as did the Stormrider, though neither to my knowledge has been called out for the kind of surprising accuracy for which the Disco is noted.
My opinion only, of course, and given in hopes you choose to enjoy whatever it is you purchase. Also note that Crosman's Maximus has received very high marks for the price. A 2K fill like the Disco if a bit lighter and having the same marginal trigger assembly, the Maximus also has great support and some mods that make it a very capable hunter or plinker.