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Today I stopped in at the crankshaft machine shop to have the original crank inspected and to get repair quotes. Repairing my original crank would cost about $325, and include welding + grinding the damaged lobe. The others would be ground & polished as needed to remove any scoring. For this engine, oversize replacement bearings are only available for mains, not for connecting rods. So they would only be able to be polished.
They could also polish the ebay used crank, but didn't recommend that option as highly. That would cost about $165.
As long as I'm changing out the main bearings, it seems like the best option is to buy the remanufactured OEM crank + bearing set for $1400. I'm pretty confident I have the best price on that. If I'm re-using the old bearings, then the better play is to repair the crankshaft and reassemble. As can be seen from the spreadsheet, bearings are actually the most expensive part of the project.
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