Pricing AG-3 certified key dates?

Bought an attractive set of circulated Barber quarters [G/VG except the 3 keys which appear to be AG-3's] from a dealer at a local coin show. Plan is to up upgrade the 3 keys and mount the set in old Whitman coin boards and frame them. Sent the keys to PCGS and they all graded AG-3 [Wanted to be certain they were real if I sold them]. What is a fair price for an AG-3 key coin? I don't find any price guides for this grade? Does the fact their in a PCGS holder increase the price at this grade level? Does this extrapolate to other keys such as a 16-D dime? Thanks for any help.
Collect for enjoyment
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I frequently use the Heritage archives for price history and find it to be a great resource. Too bad the other, major auction houses don't do similar.
It may sound whacked, but on these expensive Key Dates there are PQ AG03 coins vs the low end AG03 (laugh away, but it's true).
I look for hard gray, smooth surfaces with no staining- a real pleasant look.
Most AG's don't share those qualities.
peacockcoins
WH
Joe.
Edit: Sheldon would be proud.
Joe.
As Braddick states it depends on the quality and eye-appeal of the AG's
If the 01-s is nice with good eye-appeal and no problems, it will easily bring 1750.00+ in todays market. The demand for this date is intense.
The others safe to figure about half of good + or - .
However, Being PCGS certified and a nice higher end AG will bring a lot closer to g-4 money?
I normally don’t handle such coins, but this one so “PQ” I couldn’t resist, and neither could the dealer who bought it from me for a bit over $300. If I were building a low grade Indian set, I’d sooner own that piece than an ugly, black coin in Good.