So I have a 8-40CW sitting on my desk...

I picked up a new RPP 8-40CW body shell from my local hobby shop to replace a screwed up shell from a project I was working on years ago... it's sitting on the RPP chassis, with Athearn trucks and a Sagami motor. I've just put P:87 40" wheelsets on it, and now I need to decide what locomotive I'm going to model! I've been tempted to scratch-bash a cab to model either a NS C39-8 or a 8-40C, but if that would be too involved, I may just paint it as an ex-CR or LMS widecab unit. I'm just curious about your opinions of which route I should go. :)