Chris, I can honestly say that I have downloaded nearly all of your big routes and have had immense pleasure driving on them, however, if you want my personal favourite I would say the Amtrak Pacific Surfliner layout, as I could run both passenger and freights at the same time and it looked very authentic. Only thing is though, I thought it was a bit small in length, so if you could do something similar with an extra 15-20 boards maybe, then I would certainly download it. My other Pacific favourite is the SWP route by Norm Anderson, which I think is a great length to run all types of trains on, and Desert Mountain Plains by eso, which is a 30 mile long freight train route, in typical desert surroundings, but no passenger train facility unfortunately.
Cheers.
ex-railwayman.