headunit options for a 2008 porsche carrera 911 4s cabriolet

[Quentin Jarrell 671]

I need some input from some SQ guys. It has a factory nav so options would be to swap out the factory headunit with an aftermarket and good equalizers. Or just add equalizers to the factory unit. All highs will be mounted in factory locations. Two eight inch subs will be molded where the back seats are located. The product list includes the following:

two pairs Focal K2 power 100 KRS 4 inch components

two Focal Utopia 21 Wx 8 inch woofers

One Audison VRX 4.300

One Audison VRX 1.500

What would you consider the best way to go, money not being an issue.