#1 IN 50-140 SHARPS
The place to start for reloading equipment is Buffalo Arms. They're on the web, too.
For dies, unless you're going to load the thing to the max and ned a full-length sizer, you would probably be able to use 50/70 dies. Just consider them "partial sizing" dies. They'd be a lot cheaper than FL 50/140 dies.
I use my 45/70 dies to realod my 45/100 with no problem - except for decapping. You will need a separate way to decap the cases.