Singadream,

I can speak from personal experience as an A/V engineer at our church that the countryman IsoMax series gives excellent performance in a live situation for feedback rejection, sound quality, and durability - as long as you take reasonable precautions with them.

We've had them on performers from kids under 10 to adults over 70, pastors, singers, actors, you name it. Very reliable.

We've used them with belt-packs from Sennheiser, Audio Technica, and Samson. Of those 3, I would recommend the Audio Technica belt-packs.

I also used them in my weekend job doing A/V training for a company, Portable Church Industries ( www.portablechurch.com )

We've never used them wired in directly. In our situation, we are always looking for mobility. I understand that this is different than your situation.

Probably the most interesting application I've seen of the use of a countryman was on my job with Portable Church. That church had the isomax straightened out and mounted to the inside of the temple piece of the pastor's reading glasses that he used each week from the pulpit. The mic/business end of the isomax was right at the joint of where the lens part of the frame joins the temple piece at the hinge. They are light enough that you can do that kind of thing with them.

But they are pricey. I'm sure there are probably cheaper, wired alternatives than the isomax that would fit your situation.