Extended mag release, be it any of the aftermarkets or one you scavanged from a 20/21 to put on your 17,19,22,23,24,26,27,31,32,33,or those GAP atrocities). Ameriglo operator sights would be good, though you could go with pretty much any tritium sight. Make yourself a pattern and cover the grip in skateboard deck tape, very good working and only costs about an hour of your life (keep the discarded pattern so you can make more in the future). Tungsten steel guide rod and a Taylor Freelance slug plug are nice things to have, but non-essential. Three and a half pound trigger is nice if you like a light trigger. If you are going to spend this much on upgrading your pistol, you should really have gotten a holster before hand... Go with leather or kydex, whatever floats your boat, but don't skimp on it. Lights are also good, if you think you want a laser, spend the money on training ammo instead. I have yet to try one of the recoil reducing recoil spring guides (Hartz, etc), but have heard nothing but bad about them. A-grip is another way to go for grip enhancement, my wife's G-19C has that as well as a few of mine have a piece here and there. Mr. Cominolli makes a manual saftey for the Glock (don't buy a Glock if you want to doubt your own intelligence) as well as a modified trigger. I bought one, a trigger that is, for my G21, shot it a few times then wondered why I just wasted $100. Another thing you can get is titanium parts, they make strikers and saftey plungers, my wife's gun has both but I think she likes the fact that they match the Taylor freelance slug plug in color. These are most of the things I have done to my guns, I hope this helps.