Are you thinking PCP, break-barrel, CO2, or?
How much are you looking to spend?
Which is best across varying temps and weather?
I'd probably like to keep rifle purchase price under $500
And I don't want a 9 lb air rifle, or one that handles like a 2x12, no matter how well it shoots...
I have a couple PCP's, and three break-barrels. Mine are all in the budget friendly category.
I've got two Gamo break barrel rifles, and one Hatsan. The thing with break-barrel rifles is their is an art to shooting them well. It usually takes some time and effort. That said, I shoot my break barrels more than the PCP's because of that challenge. Also, mine are not really handy/svelte rifles.
For $500, that Beeman R9 is a rifle you should look into, in the break-barrel category. They are well known for being great shooters, and well made.
My PCPs are both under $400. Air Venturi Avengers, in 22 and 25 caliber. They are not exactly small either.
Foe a compact PCP with decent power, small size, and only about $230 , you might check out the Gamo Arrow. The Arrow gets about 18 ft-lbs, 50+ shots per fill, and would be easy enough to fill with a hand pump.