I only gamble the first 2, but these are the best options imo
1. Coronet (for a chance of jewelers mod on tiara/diadem + same reason as circlets)
2. Circlet (popular because 2sk/20fcr beats uniques and are because of that wanted and easily tradable, and have a decent value even lack of other useful mods besides +2skills/20fcr. Rares are best, but magics can also be quite good)
3. Amulets (good chance of getting skills + good mods, rares best options, only few magics are worth while)
4. Rings (rare FCR rings is what u should aim for, no fcr means the rings must have a almost impossible combination of pre -suffixes to be godly)
Dont even think about it to gamble for uniques btw. Its always a plesant suprise to encounter them, but should not be what ur aiming for
Boots have a far less chance of being good, since only rares can be decent and rares dont spawn very often. Magics are simply crap.
Gloves is doable but i wouldnt gamble these. +3/20ias are shoppable and rares are to hard to get, and a very low chance of them actually being good. (crafts beats these so the value can never be that high)
Best claws are shoppable @ anya