Thanks John. If there's no need for the 1.0mm crimper I'll probably get a PA-20 or PA-21. Doesn't look like there's much difference between the two for train purposes.
I thought about your comments, so I did some looking at the connectors and some measurements. One thing I will point out is the MM markings on the tool are NOT the spacing of the connectors in the shell, but rather the actual connector width size at the crimp. In truth, the 2.54mm connectors used for TMCC perfectly crimp with the 1.9mm slot in the PA-09 tool, and it also provides a perfect crimp for the connector. Given that fact, this tool appears to cover all the common connectors quite well. In addition, the 1.25mm connectors found on a few Lionel boards actually end up requiring the 1mm slot, which is the smallest one on the PA-09 tool. I'd consider carefully before ordering the tool, I happened to get lucky.
Here's the instructions for picking the proper crimp slot.
