If I'd replace it I would go with the highest quality starter I could find. I sell Delco Remy starters for Cummins 15 liter ISX ISL. Cummins like the Delco starter. IMHO Delco is the most robust starter for diesel engines.
Reviews of Delco Remy starter motor
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2 reviews
Just to close this out for anyone looking in the future, I ended up getting a Delco-Remy OEM Reman starter from my local Freightliner dealer for $329 including a ~$100 core charge. It was a slightly upgraded model - a 29MT vs a 28MT. It bolted and wired right up and fires up the Cummins really fast now.
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