I have a chance to pick up a very nice G17. What do I need to know about it? Here's what I do know: It is 3rd gen, with 2 17rd mags, box, and papers, LNIB (less than a full mag fired). Now I already have a hi-cap 9mm in my Ruger P89. Is there anything about a G17 that would make me need two fullsize hi-cap 9mm pistols? Thanks for the help/advice.