I can give my personal opinion on the existing support:
Harpie's Pet Mirage Dragon has a decent effect; however it is probably overshadowed by Lightning Plover simply because of how ridiculous Lightning Plover is. Harpie Channeler is very nice - it gives some explosiveness to the deck and allows it to make big Xyz plays through only one Normal Summon (though there is still sadly a net loss in cards - before Lightning Plover hits the field, that is). Hysteric Sign is very very nice, and you can go to town with like 3 Hysteric Sign and only 1 Elegant Egotist (free Harpie Queen / Channeler from your deck). With Harpie's Hunting Grounds the deck might even be able to cut down on MST ... just nuke the opponent's backrow using Elegant Egotist.
I will definitely make a deck around these when they become available on DuelNet. Stay tuned.