Hehe...yes it is looonnggg. I will try to keep it to a minimum. Do you need an LCD? thats all up to you, but if u have a guest in the car, they might want to know who it it instead of asking you. 4" is ok, it can be a little bit hard to see, but with a custom app (which i'm working on) that can be solved!. There are lots of places that sells 4". Prices varies and make sure it comes with the inverter/psu. Try www.partsexpress.com OR http://www.montanaweb.com/timeline/lcd.html#alpha. I got 4" from timeline for $150.