I really do not want to bad mouth any airgun manufacturer but as with most things you do get what you pay for. Spend the most you can afford. The top spring powered guns are made by Wiehrauch, RWS, Diana, Walther, and Air Arms and also FWB. Some of the cheaper stuff is okay and some is just plain junk. The pre charged guns are a little different but lots of up front cost with pumps or air tanks, etc. but the lower priced pre charged guns are way better than the cheaper spring guns.
I personally have one spring gun left that I plan to keep and it is an Air Arms ProSport. Spring guns I had in the past were TX200, HW77, R-10, R-8, R-7, RWS 45,and FWB 124. All were very nice guns. Again, get the best you can afford.
If you have any matches near you go to one and check out the equipment before you waste any money.
Good Luck.
Rick