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I'll 2nd RoadRunner. It is not so much a single app, but different apps do integrate pretty well and responsively. I have iGuidance and TOPO! integrated pretty well. In fact, RR can automatically switch from any screen to the nav screen when it's giving a direction, and then switch back.
I solved the fast startup issue by having it go to standby when the car is shut off. When I start the car, music starts playing before I can release the brake and put the car in gear (couple seconds). I did replace the car battery with an Optima deep-cycle for a little extra security, but it has sat a week without any startup problems.
I do sync my iTunes library over Wifi with my home PC when my truck is in my driveway. Originally I had it do it automatically whenever it was in range, but now I just do it with a button on the skin instead (since I don't do it very often). This same sync operation updates any nav maps and skin files, so I can make modifications to the system from the comfort of my home PC. I use EZsync to do the synchronizing. When you can just sync your iTunes library with the press of a button, I see no need to connect an iPod.
Roadrunner also supports customizable voice control. I started experimenting with it, but realized I didn't really like talking to the thing too much... just rather push buttons and turn knobs.
There are also a lot of advantages of a CarPC over the portable units, including sat radio, backup cam, vehicle diagnostics, cleaner install, higher quality music (portable units usually use FM modulation), and many more.
For more info, my system is described in the link in my sig.
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