Well, Rings are really high-level items now (at least 11th lvl.+; the ring of regeneration is an Epic-level item now). IIRC, Garry's wishlist outline is that is should be items at least 5th level or lower (in 4th ed. terms).
With that in mind, magic item options for Slygoth (more than 6)...
Armor: +1 dwarven armor (either chain, scale, or plate); +1 armor of durability (hide, chain, scale, plate)
Weapon: +1 thundering weapon
Arms Slot: bracers of mighty striking
Feet Slot: Surefoot boots
Hands Slot: gauntlets of ogre power
Neck Slot: +1 cloak of resistance; +1 claok of the walking wounded; +1 collar of recovery
Waist Slot: belt of vigor
Wondrous Items: everlasting provisions; bag of holding
Hope this helps