So this is my 3rd carputer. This build was beyond simple!

Pics of my SUPER EASY install.

My screen is removable and my carputer can be locked for when I go into shady bar's / parts of town.

I want to upgrade the speakers in my Altima Coupe 2011. The speakers I picked out are:
Polk Audio DB651
Polk Audio DB6501

Now to use these speakers I need a different head unit and or amp (I think).

I can't decide to go the 2 screen route with an amp or just get a double din head unit (Kenwood DPX308U)

How many people have dual screens? How much / do you use it? I mean if its just for GPS I really don't use it much in my home city.

Why do I feel like getting a new head unit just to play aux is a waste?

System Specs:
Crucial 4GB (2 x 2GB) 204-Pin DDR3 SO-DIMM DDR3 1066 (PC3 8500)

Intel BOXD525MW Intel Atom D525@ 1.8GHz (Dual Core) BGA559 Intel NM10 Mini ITX Motherboard/CPU Combo

Seagate Momentus XT ST95005620AS 500GB 7200 RPM 32MB Cache 2.5" SATA 3.0Gb/s with NCQ Solid State Hybrid Drive -Bare Drive

Lilliput 809GL-80NP/C/T 8" (4:3) VGA Touch Screen TFT LCD Display

M2-ATX-HV 140W Intelligent DC-DC PSU

Morex 5677 Mini-ITX Case w/ 2.5" HDD Mount with PSU

Centrafuse 4