I AM WANTING TO BUY A 10 MM HANDGUN!! GOT IT NARROWED DOWN TO EITHER A GLOCK 20 10MM OR A GLOCK 20SF 10MM. ANY INPUT WOULD BE APPRECIATED. DO THEY EVEN MAKE THE 20SF ANY MORE? I DO NOT SEE IT ON THERE WEBSITE! WHAT ARE THE TWO OF THEM WORTH? THANKS JOE