The AD runs about $2,000 and the props generally fail and need parts: bearings, blades, clamps, etc. that cost huge bucks. The end price almost always seems to come out conveniently just about right to make you bite the bullet and get the new props.
If you're going to try to nurse the old ones I would be extremely careful who you take them to. Once they look at them and determine them, "unairworthy" you are stuck with red tags. I would ask around and find someone who has had success getting their Apache props signed off for the AD and then take them the same place.
If you're going to keep the plane for more than one cycle it's usually better to go ahead and get the new props because they increase the value by about $7,000 and the remaining $6,700 of the $13,700 you would have spent on AD compliance anyway.
Also make sure the prop hubs are NEVER presure washed!! A very good way to destroy them.
Good luck,
Brett