Having refreshed my memory by watching a couple of reviews spending your money on a top end one will give you far more adjustment on pretty much every aspect of the pistol, grip, trigger and sights, which in turn will help consistency and ultimately your accuracy. It will also give your arm a rest between shots without all that pumping!
Steyr Challenge HFT - HW97K - HW80k - BSA Mercury Challenger - BSA Airsporter S - BSA Airsporter Stutzen - Anschutz 9015 One - AA Pro Target - AA Pro Elite - AA TX200SR - ASI Paratrooper (R) - Umarex M4 - Walther LP500 - FWB 80