If you're going to be using a PC and a console, the Recon will suit your needs better than a Mixamp.
As far as noise on the Mixamp, the 5.8 I have is actually decently noisy when you turn it more than halfway up. If you've got it that loud, tho, you're not going to notice the hiss once the bullets start flying. Just don't expect much for quiet bits in movies or songs.
Hmm, any good alternatives then?