Thanks! I listen to mostly dance, house, deep house and occasionally some random pop (when the Mrs is in the car on a long journey ).
I actually already have a brand new pair of JBL GT6-6 and a pair of Focal 165CA1 which I was planning on installing in my old A4, but never got round to, before selling it on. I was planning on using either of those for the rear tbh. Both are decent speakers from what I heard, but I'm open to suggestions at this point
OK so I'd go with the Focal over the JBL although the JBL is a great speaker, the Focal tweeter will be a bit sharper so should be able to give you the nice top end on dance-type music.
Also I'd go with a ported 8" or 10" subwoofer with the port tuning frequency around 40Hz which is where the bass in dance music hovers around.
What sort of budget have you got for sub, sub box, amp wiring kit etc?