Goldenbb, The 5906 and 6906 are great handguns. Have a 5906 with fixed Novak sights and it is very accurate. Have Crimson Trace grips mounted on it and it is a dependable bedside firearm. Would love to add a 6906 to my collection in the future. Find them a lot more aesthetically appealing than the Beretta 92.
Kenna glad to see you on the hunt for another S&W. I would certainly advise you if you have the opportunity to handle and possibly fire the S&W 3rd Generation 45's you get the chance before buying. My experience with a 4566TSW, was not as favorable as the 5906. Which I attribute to the single stack design and the different grip angle. Not saying they aren't great guns, as I have seen the targets posted from owners that can shoot them very well. With the prices you posted, if I was in the really need to have one I would look take a serious look at the NIB 4006, as it shares the same frame as the 5906--this is saying a lot as I am not a fan of 40S&W. As a side note I would really like to see a picture of it with adjustable sights, as I don't believe I have ever seen a 4006 with factory adjustable sights.