We'll I just bought a 1973 Nova, I've liked the way these cars looked for a long time

Thats Basically what it looks like, Although different Rims but similair looking
My problem is i'm looking for a decent whole setup,
2 6x9
2 Tweets
2 Mid's
and of course 2 Sub's
And i'm going for sq primarily
Music Taste's are Rock, Metal basically
My question's are
1.) should I go everthing one brand or mix and match?
2.) has any1 seen thoose Volfenhags in action? (they look beautiful x.X)
3.) L7's are they really that good?
4.) Should I got with MB Quarts heard alot about them
5.) Any other pieces I should get (mids, tweets etc)
6.) Anything else i should know?
Thanks for taking the time to respond in advance.