I've spent over $1500, not including the laptop as I got that from my old work
The GPS receiver was only $70, the software was like $260. Screen was under $300. Cabling is dear too like $200, if you go for a big amp that will up the price too. I have a 5.1 sound card - you could save $60 by using the on board sound but no front rear fader.
I wanted a really nice finish to compliment the interior of the car so I did not skimp on anything.
Time is another factor. Many 100's of hours reading on the net for ideas and solutions. Lots of late nights reading and 'shed days' while the MRS was at Golf.
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