Hifonics shit is good. Have a friend who has a 1000rms + (cant remember exactly what it is) amp that he swares by. WOn a few street spl comps with it 2.
I have a question? Why do u have to do with the same brand?
Personaly i would choose,
Head Unit - eclipse (altho it lacks in tacky features but makes up in power and sq)
Speakers - DLS, Boston acoustic, MB quart, hertz or some top end JBL. Those are all im familiar with atho there are probably alot more.
Speaker Amp - Eclipse, dls, dd (altho more for power) and more (cant remember)
Sub amp - DD, Fusion, crossfire (also no many more)
Sub - DD (for power) or eclipse, Hertz
They are just what i have heard and would choose. There are many more