RobRed is getting closer on the 01-02s. Don't quote me but I think he is shopping harness fabricators in order to control costs. I am not up to speed on the 03-05s but I think we all would have heard something is there were any show-stoppers.
Congrats on getting back in the 100 game. One question, I get the feeling you don't really care about how new your vehicles are so why the focus on 03-05? Interior update? The sweet spot is hovering around 00-02 right now and I see low mileage examples popping up out of the well-to-do burbs all the time at half the price you are looking to spend. The only must-have on my list would be the LATCH system for the kids and I think that started with the 01s. If you get one with right around 100K on the clock and can verify the 90K tune-up, going 10-15 years is going to be child's play.
The high-mileage thread on Mud has yet to find a 100 that has died of natural causes. People are breaching 400K with nothing other than scheduled maintenance.