I am considering buying my son a used car and have looked both at the NADA and Kelley Blue Book. Kelley seems to be a lot more detailed in its questions but the value seems to be a lot lower (when comparing the NADA Average Value and the Kelley 3rd Party Sale value). Does anyone have an opinion on this? Am I missing something??

Thanks!

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1994 E320 Cab (mine)
2001 Chevy Suburban (wife's)
1995 BMW M3 (son's)
1989 Volvo 740 GL (extra car--for sale)