So far I don't regret buying any of my guns, so my best buy has to be based on economics, rather than performance!
And there I have two candidates; both Ruger.
1. Ruger Redhawk, .44Mag, 4" barrel: bought new for 47% less than the retail price. That gun has taught me how to shoot a large calibre and has shoved me into reloading
2. Ruger MkIII512: bought for about 50% less than retail price!! That gun introduced me to the insanely and deceptively addictive world of the 22LR. What a great round... sooo much fun. This gun has become my most shot, despite doing IPSC with my 9mm...
These were bankruptcy stock from a second store, being sold locally.
Never nice to see a business go under, but every cloud....