Opinions on how to complete my system
AMPS
1 M240 amp (front)
1 M-2120 amp (rear)
1 KMOS 2200 (sub)
SPEAKERS
1 set of MB Quart PSC216 6.5" component speakers
I'm still trying to acquire the additional equipment I need to construct a quality system for my car. Any ideas on what components I could use to complete the system?
Additional speaker suggestions?
Crossovers?
Headunit?
The install is going into a Nissan 1990 300zxTT so space is limited.

and I already had a CD changer that used the AiNet interface.