Actually, if you do not mind, you may forget about brands. Those come with brands are basically over-priced.

I believe most ppl will agreed, 90% android head units in the market (brand or non-brand) are sourced from China mainland, meaning inside the head unit, more or less same.

Just shop at the shoppe and choose 4gb-8gb non-brand, with the similar price tag as the branded one, you can get 6gb-8gb.

Note: I dont think brand like Mohawk. Soundstream, Dynavin will develop / invent the player themselves without the economy of scale.