You are polite its a change of heart for around here. I thank you.
Ive been battling this challange for ever as well, I enjoy the double din touch screen as they are easy to control but most lack (built in) audio processing, preamp volts, and eqs.
My w200 by its self is horrible.
Pioneers screens just bother me to be honest. more flashy then functional.
I heard the 205+701 is amazing. But thats 900+500 new, used is less but its hard to find 701s... If you come across the combo for sale I would try it.
What I did was bought a w200, sold it went to a CD7000 eclipse single din, sounded 100X better. I then decided Ill stay with eclipse but I want a double din screen. I looked into the AVN 5510. Its what I have in my car now. It has a minimal crossover. Where i select the cross over point and slop for the 4 speakers and Subwoofer. Which works but I was used to the 3 way crossover of the CD7000 so the AVN was not as nice.
The avn 5510 also has 7band peq for tweaking. But the best feature is the avn has 5v preouts... 90% of the double dins/screens out there do not have more then 2v which just makes a huge difference.
I would buy used for now, that would be my biggest ADVICE, until you find what you like then when the used one dies, get the newest model of the one you liked.
Also what a lot of people do is, get the head unit they like and have the most comfortable feel with, like 205 or AVN or any other screen, and just put a Dolby Digital processor on it, from a different company. This method works the best I heard but just costs more. And you have a head unit(if single din you have a bran too) and then you have a processor and its just more work.
The whole problem with this issue that comes up a lot with me is due to the fact your trying to cross to markets.
SQ/FUNCTION vs LOOKS and BLING....
Its an age old thing of form vs function.
I like the new screen but at the same time I miss my single din headunit...
Its a hard toss up.