I believe the newer Pioneer units are compatible with Apple Car Play. If I were in your situation I would check to see if you find that feature appeals to you. I think a double din unit would look better, but I may be biased on that issue because that's what I have. I think your AVH P5900DVD has a motorized screen and that will be blocking something in the Boxster center console.
I bought a refurbished unit when I installed my system and paid around $500. So, if you don't need the latest model, it won't be that expensive. I have a 6X40 amp from a 996 Cabriolet to power my system.
Here's a thread that contains information about my installation: http://986forum.com/forums/general-discussions/51283-does-anyone-know-vss-wire-02-bose.html
Good luck with your decision.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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