I recently bought a Air arms TX200 MK III in .22 caliber. For a scope I put on a Weaver 3-8x32 with AO that will adjust to under 10 yards.
The only pellets I have tried so far have been JSB Exact Express's which weigh 14.3 grs. The way they shoot and hit I'll probally not bother trying anything else.
I have about 800 pellets through it so far. I chrono'd it with around 200 shots through it and it was shooting in the 650-660 fps. range. After a good 700 shots I tried it again and it is now doing a good 700-710 fps,. For conversation's sake my boy's RWS 48 shoots the same pellets 750-760 fps. It hits critters pretty hard. Been doing a number on starlings and garbage sparrows. Got two woodchucks yesterday as well out my mother-in laws garden. It did a good job with headshots.
It wasn't cheap, $548-, but is a well built gun. Been quite awhile since I have been in air gun mode but with this rifle I am thinking I might be for quite awhile.
Here's a pic.