IMO, all the $600 comm units aren't worth it for airsoft. A simple boom mic setup works. I use the mic+earpiece combo. You can find them at pretty much all Radio Shacks. It's been 6 years since i've been to future shop (i live in America now), but i'm pretty sure they probably have some hands free stuff for radios. The Pryme Gladiator is a great throat mic for airsoft. $100 isn't too bad for it. The only beef i have with throat mics is that they can't pick up mouth generated sounds well (like S or V). This is what i use now in my old General Electric FRS radio (still saving for a GMRS)
http://www.radioshack.com/product.as...%5Fid=19%2D315
That setup is cheap and effective. Hasn't failed me yet. The only problem is the earpiece. It's kinda uncomfortable after a few hours if it doesn't fit your ear just right. However, if you really want a throat mic, Pryme Gladiator, some Iasus models, and Firefox (cheap as it is, it works) work fine for airsoft. Oh yeah, this recently came out in the US.
http://www.airsoftgi.com/product_inf...roducts_id=980
I think it's an imitation of what ILLusion reccommended, but from what i've heard, it works great. I hope this helps.
~Trixter~