I'm hoping to run into a 4566 soon. After getting a 4506 with square triggerguard (because I wanted a 645 (I couldn't afford one when they first came out)), I've gotten a 4513TSW and 4586. I don't know why I want a 4566 now...but I just do.
Interesting, the older 4506 is seems lighter than the 4586. I guess all the lightening done before they standardized the 4500 and 1000 series did make a difference.
