what model would look the most like this in your opinion?
http://www.rr-fallenflags.org/nysw/nysw-s107ajz.jpg
Probably the P2K 0-6-0 available at Walthers. It also reminds me of an old brass Gem I had many years ago.
or even the Bachmann 0-6-0, almost an exact match
Frankly, the closest is probably the MDC/Roundhouse 0-6-0 kit, if you can track one down. This model has the correct slide valves over the cylinders.