The vast majority of rifles, on the market, are more than suitable for your aims. All you have to ask yourself, at this stage, is how much you're willing spend on a rifle set up. What is your budget?
Alot depends on where you live. If you're in England, Scotland, Wales you will be able to buy a sub 12ft/lbs air rifle from any decent gunsmith. Anything that is capable of exceeding the 12ft/lbs limit will require a Firearms Certificate (FAC) and will involve an application to your local police.
If you live in Ireland, north or south, my understanding is that you need an FAC for any air