sorry-more ??...advice re. 3 cars

[kriss]

car 1: 1999 boxster,1 owner,all service records,well maintained,21,000miles.seems pretty firm at $15k. ims/rms has not been replaced.

car2: 2003 boxster s,34,000miles, 1 owner,service records show all work done,ims done by dealer in 2007(may)at 22,000miles $22k.

car3. 2001boxster s,23,000miles,no service records,at a subaru dealer on a trade in,supposedly 1 owner, $16K....catch is the airbag light is on-I need my auto dealer pal to buy it but I have no idea of the cost re. airbag light issue.does anyone know about this?

is the '03 worth $6k more than the other 2?(given that ims/rms work for $1500 would be done on the other 2 cars to bring their actual cost up)....

thanks.