I'd buy Bind Affinity and /shout "FREE BIND DONATION ACCEPTED!"
and once they are in your group tell them that the usually donation is
around 5gp, but it is not a requirement. most people give me more for being
cool about it.

Then but SHOCK o' Lightning

then Halo of Light

then Resistant Skin

Firestorm isn't bad either, but you might want to just save for RANK 5