I second the Diana(RWS) 34 http://www.airgundepot.com/rws-34-with-scope-pellet-rifle.html
I do prefer the 34 in .177 , but the .22 isn't a bad choice
.177 vs .22 http://kirschy.tripod.com/177vs22.html
I "generally" prefer the .177 in air rifles under 20ft-lbs and the .22 for rifles over. It has to do with matching pellet weight to the power of the rifle, because. IMO, sporting air rifles tend to perform best(combination of accuracy and trajectory) when you keep the muzzle velocity between 800fps and 950fps. You do that by matching pellet weight to the power of your rifle.
Other good .22 caliber air rifles
Walther Falcon Hunter* / Walther Talon Magnum*
Diana(RWS) 350 Magnum
*not on the same quality(durability) level as the other rifles, but for the price, they are relatively powerful and reasonably accurate.
If you want to see the above rifles in action. I would suggest Rick Eutsler(Airgunweb.com) and Paul Capello(Airgun Reporter) both post video/reviews on youtube.
Added for "so can a .177 kill small game"?
Absolutely - An accurate, reasonably powerful .177 will make a quick, clean, humane kill on small game(rabbit, squirrel, etc) if you do your job(shot placement)
The UK limit before a license(FAC) is required is 12ft-lbs. They have been hunting small game with .177 caliber air rifles, under that limit for a very long time.
"Any more rifles that you can recommend"?
If you mean less expensive. IMO, as of right now the Gamo Big Cat + 3-9x40 scope from Cabela's - $95 is the best deal. These are much better rifles than the chinese built springers in the same price range. http://www.cabelas.com
The Big Cat will deliver around 900fps with 7.9gr Crosman Premiers, that's 14.2ft-lbs(on average) - Air rifles, especially lower priced ones tend to vary somewhat in both power and accuracy. But 13-15ft-lbs is the "normal" range for the Big Cat and you can expect around 1 to 1.5in 3 shot groups at 30-35yards.
Rick Eutsler(Airgunweb.com) on youtube has a good review of the Big Cat.
The one thing everyone complains about when it comes to Gamo rifles is their trigger(not good). What you can do is add a custom GRT-4G for around $30. These triggers make a huge difference http://www.charliedatuna.com