My first choice would be a Soo Line SD40-2 from SOO 757 to SOO 774 in the original curved red swoosh scheme.
They would be able to get the details in the factory closer to the prototype than the other O Scale SD40-2 models.
The next choice is a Grand Trunk Western Blue, Red, and White SD40-2.
I wonder if Rich Trowbridge would order a GTW SD40-2 with TMCC, or he would think they are too expensive.
Andrew