It's complete! New Euro bumper installed and they nailed the color match. Replacement GTS lip installed as well. It's a pain installing them but I got it to fit perfectly. New emblem was the finishing touch. This was the last major item on my wish list and now the car feels so clean and complete.
After I get the windshield replacement done I'll likely just be focusing on maintenance items as I go along. At this point I've got the car in my ideal form and it feels great.
Scary thought but as soon as I finished this I started getting an itch for an e60 M5 despite all of my logic and reasoning faculties telling me otherwise. Will see if that ever comes to fruition or if the itch will subside..