Hehehe...Thats okay budy, atleast you are honest unlike a certain person posting everywhere around here. Just make sure you search old posts before you start new ones.I'm not all that educated in the audio area
How loaded are you?? Yeah you can get a laptop going in your car no problem. But those things arent exactly cheap. So I would assume you would go with an old one. Thus, you will probably have to fork out some extra cash for a better soundcard and a bigger hard drive (not cheap).
I think the consensus (can never spell that word) around here is to build a desktop from scratch saving you tons of money first of all...and it will be much faster and more powerful than a laptop. Then again, I have all pioneer in my car (see sig) runing nav, dvd, tv etc. All depends on how much you spend or what kind of connections you have to get stuff cheap.
My advice is to hang around here for a couple of days and you will pick up everything you need to know about getting a LCD in your dash, building a sweet powerful desktop, and installing it in your car. Check out peoples websites. You will be amazed at thing things these guys have done. Dont resort to blowing a big wad of cash just because it is easier. You will have much more fun and pride in your car when you start doing things yourself.