Ruger P95. Reliable, cheap hi-caps, smaller/lighter than some others on the list (Beretta 92, for instance). Fits my hand -- I shoot it better than other 9mms I have tried. Way less expensive than many listed, without sacrificing function or quality.
Your mileage may vary, chacun a son gout, different strokes and all that. The best choice is the one that you can make consistent fast hits with.