A couple big omissions from what's listed...no upgraded speakers/amp for them? No sound deadening?
I'd pass on the Hifonics and get a real amp, as well...
Several different people have had problems with them, they are a terrible company and carry a bed rep. Stay away. Not saying every single person has been fvcked by them, but its likely to happen if you have to rely on any type of customer service, since they lack any whatsoever.