I have a samson Q7, the brand has virtually no street credit but its worked wonders for me and quite a few audiophiles who are sick of Sure's inability to refresh their product line have actually praised the Samson Q7 saying that it's marginally better then the SM58. That said, look around, try them out (no matter how akward it might be) and walk home with an awesome mic!

edit: well when i said Samson has virtually no street cred i meant compared to sure mic's, b4 i get a loud outcry (samson are known for their wireless solutions i think)