Looking to UPGRADE

[udeluz]

My wife has a 6 speaker non NAV in her 300L
I want to replace

6 speakers
Add a sub
Add one or two amps perferably only one to run the Sub and doors/dash/rear deck

I do not want to change the HU since it is a lease.

[MagnumRT05]

Infinity Kappa 3.5s and 6x9s.

And uh, a Dual 2 Kicker L7 with some Kicker/Sundown/Hifonics amp...not sure which though. The sub is 800 RMS so anything around there...