Tuj: one thing about the 5906; if you get mec-gar mags, they hold 17.
The magazine also fits the 659 and, I think, the same company makes a 20-round model. Good luck in finding any, though. In Maryland, lawmakers see 15-, 17- and 20-round magazine possession as evidence of intent to commit crimes. They say you don't need them for defense or target shooting, so if you're caught with one, they presume you must be guilty of being up to no good.
Water-Man: All things considered, Glock & M&P are the best 45s on the market today IMO.
Kitchen knives also make for some of the best defensive knives available. Yet most knife collectors don't invest in many. Or carry them. I like Glocks. They make for great defense pistols; however, they're about as interesting as a hammer or kitchen knife.
I don't pick up a gun magazine and say, "Hey, that's a beautiful Glock!" But I can admire a beautiful blued steel or stainless steel handgun like a S&W 66 .357 revolver. They say that the great warrior Achilles was sent to a girl's school so he wouldn't be forced to fight in Troy. The great tactician Odysseus, however, being tipped off about this, arranged a bazaar. On the other tables were beads, oils, perfumes and such, but on one table his men featured swords, bucklers, shields and other implements of war. When one of the "girls" walked over to the table with weapons on it and began admiring them, Odysseus had him seized and thus Achilles was inducted into the Greek army!
Many men have long admired the beauty and craftsmanship of armor and weapons, but Glocks and these other plastic, square, boxy looking pistols that have been frozen, thrown out of helicopters, put in mud and undergone all sorts of abuse and still work, while technological wonders, aren't very pleasing to the eye.