Depending on your time frame you might consider an Atlas S2. I have 2 of these and they they both purr along beautifully. One has a TCS M1 decoder and the other a Digitrax DZ143. I prefer the TCS, If you're wanting something with sound these would be a challenging install so you might consider an Atlas with sound.
Joe
I'm very satisfied with my later Atlas purchases, and I have a number of them.
If I were you, I would pick up a GP-7 or GP-9. either low hood or high hood depending on where your layout is located in America. This would be for the reason that in some areas there are a larger number of one kind or the other that they would more than likely pick up second hand.
Do not hesitate on Atlas now, these are very good units.
Johnboy out.............................
from Saskatchewan, in the Great White North..
We have met the enemy, and he is us............ (Pogo)
I've heard good things about the 15s, but for a mill, the NW2 is the righht setting. Most likely, purchased secondhand by the mill. NW2s and the early SWs just seem to be mill engines.
-Morgan