Hello Phillip and welcome to the Cow Audio Forum.
Sorry for the reality check, but you should be looking at your checking account; maybe buy a lottery ticket. Really good wireless audio doesn't happen at $500-$600 per set.
The best wireless audio I have heard (and I review gear for a living) is the Audio Ltd. 2040 with a Sanken COS-11 lav. That'll run you around $5k per set. For a listen, check out the files in the Audio Ltd folder on my site here.
http://idisk.mac.com/tyreeford-Public/Audio?view=web
The range of the Audio Ltd is also the biggest I have measured.
Following that are Lectrosonics and Zaxcom. They run around $2500 to around $4k.
The Sennheiser G series, at about $600 are entry level for pro work. Replacing the stock mic with a better one (add $300-$400) and you'll improve the sound. I think the new G3 series comes with the MKE2 mic which is supposed to be better than the ME2.
Regards,
Ty Ford
Want better production audio?:
Ty Ford's Audio Bootcamp Field Guide
