Two of my favourites are the 2009-10 Panini Crown Royale Royalty GU /499 and also Premier Penmanship Gold #ed to the player's jersey from 2007-08 UD Premier
Jambalaya's (the original ones are most certainly better)
Limited logos (any year really but especially the first couple)
Ultimate logoman sets are beauties
Precious metal gems (97-98 set)
lol i dont mean the base. Some of the inserts sets where pretty good, like franchise futures, towers of power, total o, rookie phenoms. Obviously not all the sets where good.