I can say with a fair assumption that it's not your head unit causing the problem. All head units draw 12v and I think have a maximum of 10 amps, which they never get anywhere near using. Your head unit certainly won't be causing the car to cut out (feel free to correct me if I'm wrong anyone). Sounds like it could be your alternator, or even battery, but I've never had it happen on me so I'm only going on guess work.
I get what you're saying, trust me I do, but a little help is all I was asking for. You may find my responses amusing, but I'm getting pretty tired of it, I except you have an opinion, but unfortunately for me my imagination when it comes to picturing my car looking a certain way is limited, and as stated, I don't wanna spunk money on something I may end up not liking!! Thank you for all your input, it's greatly appreciated.