I got a pair of Arctis 5 for free from SS (As a replacement for an old faulty headset), the mic is great compared to every other headset i have used i get compliments on how decent it is. The sound quality is good nothing amazing but not bad either they get fairly loud and overall comfort is good they are very light and can easily be worn all day if need be.
The arctis 5 seems to be the best pick as it offers the best features and performance, from what i have read it would appear mic and sound quality suffers slightly on the arctis 7 due to the wireless.