It all depends. The ruger 10/22 is very popular with a tone of after market parts available. I kind of regret buying the Savage TRR-SR instead of the 10/22. Next is the Ruger pistol 22 line.
AR15: Spikes lower/JD upper, Scoped 6-24x40
Savage 64 TRR-SR: Scoped 6-24x44
Sig P226: .40s&w full stainless
Springfield 1911: 9mm full stainless with alumagrips
Beretta M9: 9mm custom barrel & rod with alumagrips
Browning Buckmark Camper: .22LR Stainless