I looked at Prods a while back, but I know I'd get too impatient to tune one to the performance I'd get from a stock rifle.I think the 510 is looking more and more like "the one"...
Knowing that for some strange reason everyone wants new-except some old timers and folks who shoot matchs- I'll stick with my used advize and +1 that idea of a used BSA Ultra.
The Rainstorm at 39" and 7.2 pounds is a pretty handy little carbine, can be easily detuned by changing hammer springs, and with the big air reservoir at low powers it gives tons of shots.
Interesting to see how this kind of morphed. Are 3 on that list I'd not call really light weight. Not that that is a bad thing, can normally shoot a medium weight rifle better than the light weights.
Light weight, powerfull, repeater. Sounds like a Sumatra carbine is in your future.
I will tell you one thing- if I ever cross over to the darkside I will definitely buy used. I imagine I probably won't by another new airgun period, except maybe from flying dragon with a full tune. With the deals that come up in the classifieds, I don't think any of the other retailers can hang. Lord knows I have lost enough money buying new and selling later on.