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Also check the condition of the cylinders. At 50k, they should still have the cross-hatch pattern on them. If the pistons look okay (skirt wear pattern is suspect), compare specs with measurements for piston ring side clearance and piston OD (and thus piston-to-cylinder clearance). I've seen new sets for $1500-$2500. If all is okay, add in the cost of a new ring set, then price these accordingly.
Some say the life span of JEs is not on par with the factory Mahle's. Same with piston clearance. The more clearance, the more noise, especially during warmup. More clearance at normal operating temps. creates more ring wear as well.
Don't polish the pistons (only the crown, if desired).
MHO,
Sherwood
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