oh so its important to you to keep the same brand?
Im just asing because for the value DD isn't it but what it is is very good stuff some of the best money can get you.
that being said I personally look for the value of things. for example the DDm3c is a great amp that does ruffly 3800 watt but its going to cost you about 700 bucks.
now on the other hard this amp is going to be nearly identical for 599 NEW