Ring the Golden Bell to make melee attacks at range, but I'd rather just have an ally to cast Blood Wind if possible.
Some pressure point feat to let you burn more uses for healing, paralyzing and other exotic effects, is sort of nice but hardly mandatory.
Only straight-out power boost feat I can think of is Pain Touch, so the round after you stun the foe, he's nauseated (ie, you rob him of two rounds of actions instead of just one).
The monk pc in my game uses the Draconic Fist alternate class ability which is quite effective, especially if combined with the alternate class ability in PHB2.I disagree, stunning fist is awful.
Well I've never tried too hard to powergame stunning fist, since I'd never play a straight monk. But I dispute your claim that casters are immune to grapple at high levels. The only way you're going to be immune to grapple is freedom of movement, which isn't available until level 7. In my experience of reading 3e adventures, casters almost never have this even when they reach level 7 or should have the ring.
I do know what DCv1 is. Is that Dragon Magazine or something?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.