I would like to get the RWS Model 240 Schütze myself, I have read some good reviews. Airguns of Arizona has them for $175.00. sounds like a great deal. snookman
I'll second the qb with an effective ldc as silent sniper choices. Hopping up is easy. If you can find a 79 you can shoot 300 or so shots on a tank even with gas hog mods. Other choice is a haerli 850 which is as powerful as a nodded qb only like that out of the box. I'd recommend the red brake suitably modified or RFM shroud as good options as well. Aspringer is going to make mechanical noise no matter what you do to tune. It will just be relatively quieter but it won't be silent.