It's been a long time since I've had an HO scale GP7 model. So many out there now. Here's my question: WHAT is one of the smoothest running GP7 models available now? I've watched Youtube videos of the new Athearn Genesis GP7 and, frankly, I'm NOT impressed with its slow speed (jerky) performance as reviewed. The Bachmann GP7 w/Tsunami Sound is way smoother than the Athearn in the review videos, but (as expected) doesn't have the detail niceties of the Genesis model. (This can be corrected with time, $$, and detail parts.) The Atlas Classic still has the cast metal frame, which makes frame modifications/detail adding a total pain. Has Walthers come out with the former P2K GP7 w/DCC and Sound? What are your choices and your experiences for an HO scale GP7???