The Glock 17 is really a sweet gun good choice. Some differences of opinion then some:
"less oil is better than too much".....it's a Glock, as long as you don't foul the chamber, too much oil will hardly effect it. You dunk it in oil and then roll it in sand and flour. It'll usually still run. So for all practicle purposes it's not rocket science. just lube it as the manual says, which coincedentally is nearly the same as most pistols. Learn to detail strip the side, clean the striker dry on a routine basis.
"stock glocks are the most reliable"....never seen this proven. modified Glocks run fine, sometimes better, if you know what your doing. Lone wolf steel recoil rod and a good spring can really fine tune a Glock nicely. Spring kits, trigger tuning can all make a difference if you do your homework. The Glockworz Fulcrum trigger is a work of art. Gives the Glock the second best combat trigger I've ever shot. Test 'em yourself. Nothing fancy or super high quality in a stock Glock, most good aftermarket parts are better built than the stock stuff. Not that it really matters, no mods are really needed. Do your own testing.
"don't worry about changing springs".......They are cheap, sometimes free. Change them as if your Glock was a spring eating 1911 and you'll allways be fine.
"M9 is best for milspec stuff, blah, blah, blah"......I can think of three guns worthy enough to compete for best pistol ever: Glock, M1911a1,......is the M9 the third? No!
ps. all 17's need a 19 to be happy.