Beeman, RWS, and Webley all make top-tier gaming/recreational air rifles. Gamo is junk, as is most of the stuff sold in retail stores. Benjamin-Sheridan is a possible exception.
You need to determine how much money you want to spend. Don't expect to buy a decent quality spring-powered air rifle for less than $200. The Benjamin-Sheridans are <$200, but you must be willing to pump them several times. Gets tiring really quick.
I also would strongly recommend against purchasing an air rifle for taking out anything larger than a squirrel, unless you are an experienced airgun user. Spring-piston powered airguns have a particular recoil cycle that requires a LOT of practice to become proficient enough to take out any kind of game. And don't even think of slapping on a scope to compensate for lack of practice/skill; springers will chew up lesser scopes like you would not believe due to their two-cycle recoil.
Bottom line- get a trap, call the authorities, or recruit a friend who knows how to shoot a .22 (if legal in your area) to take the critter out. Not worth it to make the animal suffer by poking it full of holes with a cheap airgun.
P.S. Serious air rifle hunters typically spend upwards of $1500 for a good rifle/scope combo, especially if the game is larger than a woodchuck. You need a high-powered .22, or even .25 air rifle and serious accuracy to take something like a raccoon down, and even then, your effective range is usually <40 yards.
www.straightshooters.com has a great selection if you want to get started in precision airgunning. PM me if you want additonal info- precision airgunning is a great, great hobby, and one that I plan to re-start once I have my own backyard again.