I'd like to see the small Alco FA-2 offered in a few more paint schemes.   Here are a few suggestions:
1. Santa Fe in traditional blue and yellow freight 
2. B&M in blue
3. CN in black, orange, and white
4. Berkshirers and Hudsons in undecorated paint (I love my Berk, but am not a fan of Luxury Lines)
5. F-3 in B&M, MEC, or BAR paint (Williams has done a nice job with BAR units.  I have my Bar GP-9 and BL-2 running on my layout now.)
6. Maybe an upgrade sound board with steam and diesel sounds.
7. How about the K-Line switches that were made by a company that I believe Bachmann now owns
8.  Keep up the good work!