I bought hyteck for 150 and it had the speaker ,amp ,hovi , voice changer and mic .... i had the same problems with feedback but found a way to eliminate it with sound proof foam and a face shield . I had to replace the mic and the hovi do not sound good and i was in touch with them to replace them but have not heard back.
I saw hovies on eBay for 120 from one of the members here and they seem legit . Im hoping to get them later on when i recover for what I've been spending on electronics for helmet .. it sounds good without the hovies but thats just for me to have a helmet that works independentlyfrom the chest speaker. my recommendation is if you are getting hyteck get just the little square speaker with the amp and transmitter .. i hope this helped .. i can show you how it sounds just let me know