You might try some of the following sites:
nadaguides.com, hemmings.com, cartraderonline.com, ebay.com and also search the "cars and parts" area of this website. You should be able to get a pretty good feel for what 69's are going for. One thing I've noticed is that fall and winter are a much better time to shop for a car. You'll get more car for less money this time of year.
'69 SS clone 350/300
'65 327/275 Corvette Coupe(previously)