[uvaspina]

PSA charges more if the declared value is over $500, I believe. Also, you'll have to buy a membership. I think their turnaround time is relatively fast though.

Personally, I like Beckett/JSA auto slabs. From what you're describing (Koufax? Aaron?), it'll be $30 a piece, and will be turned around in 10-14 days (approx).

I bet if you posted the cards here, some of the resident "experts" would give you a good idea of whether they're worth sending in. (Might give you some peace of mind/save you some money).