What's wrong with the Atlas GP38-2? (master series, not trainman)
The Athearn RTR GP38-2 comes in three versions. One is the Blue-box shell on a Blue-box chassis but with celcon handrails, the second one is identical to the first, but has a hex drive, and the third is an upgraded blue-box shell with grabs, but no see-thru fans, and no DCC plug, has celcon handrails, but has the hex drive.
There are currently no Athearn GP38/40-2s with see-thru fans, or DCC ready/quick-plug equipped. Athearn has been running and re-running the old tooling with new paint schemes. Maybe they should hire Chris Clune again to tool them some nice geeps. (Chris Clune is the guy behind ExactRail. He did toolings for many manufacturers. One of his examples are Athearn's SD50s and SD60s, which he came up with the tooling for.)
I think when they get around to using the RPP tooling for the geeps (if they even have it) then they will be as good as the SD40s, GP35s, SD45s, etc.