
Welcome to the GTA forums, Gerald. I haven't been a member here very long either; I think you'll find this a nice place to be with lots of friendly and very knowledgeable people around to help people like you and I out. The search function also comes in very handy too, and if you can't find an answer you can always just post a thread like you've done here.
For reference, the GRT-III trigger CaptGeorge referred to costs I believe around $30. I've never had one but many people swear by them. As for getting a Quest 800X tuned, you could go with Gene Curtis and get the GRT-III installation packaged with the tune (for the extra $30). His website is
http://www.airguntoys.com/As for getting that B-26 in the classifieds as Daveshoot mentioned, Mike Melick seems to be universally regarded as a magician with BAM guns, especially the B-26. His website is
http://airgunartisans.com/flyingdragon/If you go to the "airgun reviews by author" link (at the top of the page, in the center, beneath "target shooting gates" and the GTA logo) you should be able to find multiple B26 reviews, and maybe some of the Crosman too.
I've heard good things about both the Crosman Quest 800X and the B26 mentioned in the previous posts to your thread. I don't think you can go wrong with either, though I would definitely get the new trigger for the Crosman and maybe get it tuned also. I don't know if the B-26 in the classifieds needs tuning or not, ask the seller.
Oh, also for reference, the B-26 is a copy of Beeman R-9; while the Quest (i'm not so certain here) takes after a Gamo model, I don't know which.
A definite plus in favor of that B26 in the classifieds is the scope that comes with it, seeing as you want/need one.
Just my thoughts on and a little side info on the matter. I'm no expert though, maybe someone needs to check all this lol. Also, what is "moderately priced" to you? depending on what you mean by that, there may be some other airguns that fit the bill for you.
Good luck in your search, and once again, welcome to GTA.