With a little help from old st nick, I managed to get my hands on a Amtrak Siemens ACS-64 this holiday. I just put her on the track and it's a lively little number. Although I've barely delved into the myriad of options. I look forward to putting some amtrak cars behind it at one point, and maybe getting my hands on some other amtrak engines in the near future.
I paid $200 even which was competitive with some the online big boys. (in fact slightly better, less seasonal sales and promotions, etc...) Seems of good quality and competitive with the other brands better known for it.