What are the features you wont by priority.
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Sound quality
-Ease of use/integration (menu, gui, factory feature compatibility)
-Reliability (parts, components, quality, history of malfunction, etc)
-HD reception/clarity
-LCD display quality / Touch screen responsiveness
-EQ complexity/configuration (a. easy to choose tuned defaults b. easy to fine tune beyond)
-Navigation usability. (I don't want to shell out cash for a system that's going to go obsolete for something I can buy or replace and hang from the windshield. If I'm going to shell out a few extra benjamins on a HU I don't want to find it obsolete or less than helpful down the road when I can easily use my 3gs for the same; if so I can easily buy a DVD only unit and I'm back in the same predicament but in terms of that discussion.)
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The list is probably not accurate and I could think of other stuff but it's late and it's that time.. But I'm curious as to any thoughts anyone might have, below is my original response prior to the quick 'list'....
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TBH I'm actually looking forward to new features i've never been able to afford myself prior. Addition of navigation (why have one if it doesn't work well right?), DVD system (the TB comes with a rear monitor so I already have one and I'd like to add the feature to the front), ease of use with my iPhone 3GS (my 7200HD has this but it's pretty clunky and not very user/+driver friendly), and lastly upgraded HD quality and pandora radio; I like the idea of being able to find/listen to secondary HD channels along with the use of free pandora.
I'm a computer guy so nothing peeves me more than a system or a GUI that's not responsive when I engage a task/function/or button push. I'm not going to dynomat my entire interior but I will be expecting a crisp and superior sound quality (something like a pair of new 60.9cs's (or the like) along with my pair of 1262W's that I already own (no need to upgrade until dead/blown/gone). I'm going to assume that out of competition that most "premier" HU's today are going to offer like quality in general. I don't listen to rap on the norm but I can and do, typically I'd go for rock/country/metal (yeah i know).
I already own a kappa 4 and I'm going to scrap the MB i have for my subs for a kappa one most likely (I like the size of 'em and so far I haven't had anyone sell me on anything else - willing to listen and entertain the argument/thoughts though =D ).
That all being said one might be able to say that any top of the line HU would fit for me and I wouldn't know the difference .. Maybe in many aspects but I'm very familiar with GPS technology and I am an avid user with handheld (flight/marine) garmin/magellan devices. I like that kenwood uses built in garmin technology. I'm not sure how well the Pioneer line holds its own but I've read more unhappy reviews than blown away reviews recently. I like that the newer decks seem to work well with BT music but all I've found thus far regarding steering wheel controls (mfgr) seem to be guaranteed to work with 2005 and pre-2005 systems - I'd be quite annoyed to buy my system and hookup my ASWI-PS to find out things don't go well or god forbid my seat warmers or climate control quits or ticks of the HU somehow.
~S