Hi Algae,
Stay away from plastic ones and go with metal XLR connectors and plugs.
Check out this store:http://www.speakerrepair.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=genem&Product_Code=37-250x10&Category_Code=AG+Accessories
Their connectors are pretty good and just like Neutrik. While you're at it, check out their mics:
http://www.speakerrepair.com/Merchant2/ ... ccessories
These mics look and sound just like SM58 and they are so cheap.
Cheers,
JD