I feel for ya, it is a tough decision to make. I had been thinking about getting something done since August of '03 and could never quite pin down what I wanted to do until my buddy called me and told me about the Pioneer set up.
If it is a matter of funds then maybe get the head unit you really want now and you can always add the nav later if you decide you need it. I bought mine cause the price was right and it has a ton of features I can definitely use.
Can't give you any info on tv tuners since I don't have mine yet. Good luck.
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