IMO accuracy is more on the shooter when it comes to handguns. I make smiley faces on targets with my $500 glock 17 for instance, but thats just me. Theres a funny line in the movie Dawn of the Dead (1976) "The only person who could miss with this gun is the sucker with the bread to buy it." -Peter. I don't think buying an really expensive gun is going to be the key to accuracy any of the major lines like Sig, Glock, S&W are legit for accuracy.
G34 would be my recommendation