The two rifles I can recomend are the R7 as mentioned, and the Benjamin pump air rifle. I've had my R7 for 30 years and asside from replacing the piston when it dried out, it's been a reliable and accurate rifle that I've shot 1000's of pellets out of.
The Benjamin is a 22 that was my dad's rifle as a boy. I don't know how old he was when he got it, but it's likely over 70 years old. We did have the seals replaced about 30 years ago. It's not as accurate as the R7, but has the flexibility of being pumped a few times for plinking and practice, or pumped 7-10 times for hunting.
The less expensive springers are generally not going to last anywhere near as long and have plastic parts that are going to wear out or break.
