Hi there,
Welcome to the BBS!
When you get a sec, take a little time to fill in your profile, folk can get a bit funny about that on here.
In terms of springers, there's quite a few of us out there still shooting the venerable Meteor, which is usually sitting around the 2/3rds of full power mark, but has probably taken more game over the years than any other air rifle available.
As mentioned above Air Arms, HW, BSA, Webley et al all make decent spring rifles. the best advice is generally to get yourself down to a local club where people are usually only too happy to show you round the various rifles available, again filling in your location would aid in this. Short of that, a decent gun shop should allow you to try a range of rifles so you can see what suits you the best.
Cheers
Rich
Wanted - Venom Mach 1/2 Trigger