The Talon co2 is a neat looking rifle...but consider, a QB79 will fill the same role, can be tuned (or ordered from Flying Dragons) to the same performance, and can run from a 9oz. tank (or a 3.5oz, air sourse, remote line to a 20oz. tank, or even back to a 12gr. adaptor). Whole lot less $ if a bulk-tank gun is on your mind.
For the back yard, even some hunting, the 2240 (or 2250) is certainly light enough, accurate enough, and powerful enough to keep you entertained. Money comes into play here as well...the best deals on the 2240/2250 set up 'rgiht' would be through the Crosman custom shop. No valve changes, but the steel breech, choice of barrel lengths, etc. make the gun more firendly (without the steel breech, have to use the kind of "sucky" barrel-clamp-mount). Wihtout any "bling" will end up in the $82-$85 range. Consider, the base price of the box-stock untuned QB78 is less than that.