SQ double-din headunits

I am wanting to get a double-din head unit for my 1996 Lincoln Mark VIII (1995-1998 Mark VIII's have a double din unit stock). I have been looking at the kenwood ecelon stuff, the eclipse stuff, some pioneer stuff and the new clarion MAX675VD; here is a link:

http://www.clarion.com/us/en/product...643389338.html

I am not too interested in navigation right now, but might wanna add it later (can't do that on the eclipse stuff), I am interested in 5.1, but only if I can figure a place to mount the center channel tastfully (anyone familiar with the Mark VII dash, feel free to throw out some ideas). The biggest concern for me is sound quality. I am rather particular in what I like. I listen to a very broad range of music ;no rap, modern R&B and very little country, most everything else is game. Classical, movie soundtrack, talk radio, comedy, jazz, fusion, latin, most anything. A good portion of what I listen to is progressive rock (dream theater, rush, ect.). If you r familiar with Magnepan speakers (high end home audio speakers) and how they sound, this is what I prefer, but with a bit more bass. I like crystal clear (but not piercing) highs and well defined mids; not just boomy bass. I have always used clarion amps and gotten superb highs and midrange, IMHO. This and the ability to add on the features to the head unit I want at a later date, have me leaning toward the clarion headunit. Problem is I have never used a clarion headunit, or speakers for that matter. Second, I am not that familar with all the higher end car audio brands, so I am wanting to explore some options. I have used JVC and pioneer head units in the past (lower priced ones). Any thoughts on these or other double-din head units would be welcome (don't want a flip-out screen). What are considered the best SQ headunit companies?