Agree, but IMHO none of the ones listed fall in the category of "nice", Avenger bullpup is midrange and is a great all around choice.Budget???? You can buy a nice PCP for $2K or one that works nicely for $300.
Get a Gamo Urban it will do what “you” require. A solid, low price gem with a BSA barrel…For Bird Hunting Like, (Dove, Pigeon, Grey Francolin)
If you'll be shooting well below 50 yard, add Umarex Notos to your list, super compact and you'll get 18~20FPE right out of the box, plenty of power for those birds and squirrels, the money you saved you can buy a decent compressor or scope, or more pellets.For Bird Hunting Like, (Dove, Pigeon, Grey Francolin)