[perezfan]

For something like that, I would recommend Legendary, H & S or Lelands. It's not high-end enough for SCP or REA (and they would not take it unless you "bundle" it with something else). Hunt's would probably want to put it in their monthly Internet/Phone Auction and Heritage would put it in their lower-end Weekly auction.

Best to go with Legendary, Lelands or Huggins & Scott... whoever gives you the best commission rate and/or can get your item in the soonest (assuming you don't want to wait forever to be paid).

Editing to say that Premier is another good one (especially for mid-range autographs like these).