I really like that blue stocked gun! Neat looking. (
Weihrauch HW97K Blue)
I've never had the pleasure of using the underlever system for cocking, but - in theory - it should be more accurate as the barrel isn't be moved for every shot. ($690)
The Beeman R9 (aka Weihrauch HW95) has a great reputation for accuracy in a sub-$500 gun (sub-quarter inch groups at 20 yards.) And it has the 'traditional' walnut stock, if you lean that way. ($340)
The Beeman R11 (aka Weihrauch HW98) has stock adjustability, which is good if you aren't the 'average' sized shooter. Style-wise I'm not really digging the 'vent' appearance on the sides of the stock, but to each his own. Again, supposed to be very accurate, which is what you want. ($640)
You asked for opinions. I think all three guns will be "good" and do what you want them to do. If it were me, with my aesthetics and my money, I'd be going for the BEEMAN R9 at $340 but mostly because it is the only one to come with iron sights! Should your scope ever go t-i-t-s up, you will WANT/NEED those iron sights until you get a new scope on there. With the other two guns, you are just SOL if the scope dies.
From a purely "I want that!" perspective, I like the under-lever cocking feature of the Weihrauch HW97K, and the blue laminated stock is a real looker. I like that gun. (Just wish it had iron sights as a 'back-up'.)
Looks like you are going to 'win' with any of these three choices. Also, the Hawke air rifle scopes sound like they are the ticket for these 'springer'-type guns, so you should be all set with whatever you pick.