Welcome to GTA,, very nice to have you with us

As for your question......if you're looking for a hunting rifle then I would recommend either the RWS 48 or the 350. I own both and they are awesome hunters, easily capable of taking out any small game you may run across including game as large as raccoons, woodchucks and possums.
The 350 is a rather long gun, which is why quite a few people "chop" the barrel, however I left mine stock and don't have a problem with it. The 48 on the other hand is a much shorter rifle but it is also a bit heavier than the 350, however since it's a "side cocker' it's very easy to install a set of sling swivels on the 48's stock which makes it a pleasure to take on long hunts in the woods. Since the 48 is shorter it's also easier to maneuver with the rifle when hunting in thick brush and such.
Both rifles have a good "out of the box" trigger and both rifles can be incredibly accurate if you do your part. The 350 is quicker to reload since it's a break barrel rifle however once you get used to it the side cocking 48 can be reloaded quickly as well.
From the "hunting aspect" If I had to pick just one of them I'd go with the 48 due to the shorter length, the ease of installing a sling, the better overall balance of the rifle and the fact that the 48's extra weight, while a turnoff to some, actually helps absorb the spring recoil of the rifle.
Stay away from the Walther rifle..... it's a harsh shooting rifle. You'd be much better off with an RWS.
The Beeman R-1 is supposed to be a real nice rifle as well but I don't own one or have any experience with one so I can't comment on that rifle.
If you decide to go the PCP route then I would say get a .22 Discovery/Pump combo, there are some good deals around now. The .22 Disco will give you good accuracy and good power and the PCP's are much easier to shoot accurately than a spring rifle since there's no recoil at all. The other nice thing is that on a PCP you can use any scope you'd like due to the lack of recoil. If you go the springer route then be sure to get a scope that is "springer rated", like a "Leapers" or "BSA". These are just a couple brands of springer rated scopes, there are of course others available as well.
Well, let us know what you choose and again,,, Welcome to GTA.....
I"ll be looking forward to your future posts....
Jeff