Let's go with the ring of regeneration.
And...Eldritch Heritage Arcane Bloodline gets you a bonded item. You take a ring, which gets you an extra spell per day you know spontaneously (including from your paladin list). And you can make it a ring. Which you can enhance as if you had forge ring. Which makes that ridiculously expensive ring of regeneration WAY cheaper.
Yes, Forge Ring gets you the same thing, but this is probably better if only for the extra spontaneously cast spell per day...