I have often been misslead by KBB pricing. the better indicator (no surprise here) is the actual market value. In other words what are these cars actually selling for in a particular market place. I check out the internet (with my zip code) and hardcopy ads and call to see if they actually sold. I bought my excellent condition '82 300D over KBB estimates because that's what they were going for at the time. i sold a few early and mid 90s BMW s and had to price below book value to get them to sprout wings and move them out. I'm not really sure how KBB bases prices, it would be sad if they simply use some sort of formula with new cost, age, etc variables and little consideration on imperical data. Maybe someone else has some insight on this.

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1972 450SL
1982 300D Turbo