In my experience, I haven't noticed any issues with the A50's mic or sound; both were actually quite good, for a wireless headset. I tested a pair for 6 months and liked them a lot - the only major downside is the price
they are overpriced, but excellent nonethelesshttp://www.headset-ratings.com/astro-a50-wireless-headset-review/
the range was better than my tactic 3d omegas, and basestation has optical-out, so you can pipe the sound to an AVR or whatever
I haven't tested the Commander model, but plantronics as a brand is usually pretty solid. their 780 is a great budget model and they have some other good stereo cans.
like GhosT noted, the Siberia V2
is another good headset its price, but if your budget is €300 there are better options (that cost more, of course)
good luck man. happy gaming