OK here is my 2cents...
I personally have had three dvd head units.
First...Panasonic CQ-VD650u touchscreen (not flip up)
This thing is bulletproof, simple, easy to use, ipod compatible, reliable and cheap!! reverse cam input, auto dimming screen
Downsides...Nav unit is extra 800$, picture quality is not the very highest of quality, no rotary volume knob, ipod cable not included but cheap at around 70$ CAD, not the very best sound quality, but not bad by any means
Second...Alpine IVAW205 (not flip up)
Great features, touch screen "touches" your finger back, good ipod control and Nav expandable easily with the blackbird unit, Reverse cam input and fairly priced. and really good video picture.
Downsides..Nav not included, buy it seperate although not very expensive, The volume is is big stages, by that i mean it increases rapidly, and uses a button not a rotary knob, Ipod cable not included and is expensive, manually dimmer screen at night
Third and currently in my titan...Premiere Avic 90BT (not flip up)
TONS OF FEATURES....., wicked ipod interface and control, ipod cable IS included,SD card slot, USB port, top notch video quality and amazing sound quality, Navigation is built in!! no need to buy a module, rotary volume knob. The NAV is incredibly good
Downsides...EXPENSIVE and PROBLEMATIC!!!!
Windows based programming...
the unit is very expensive but you do get alot for your money.
The unit has quite a few "bugs" that sometimes cause it to lose ipod connection, sirius radio connection, sometimes randomly turns off, sometimes randomly freezes up, sometimes wont start up or freezes on start up page. Long boot up time as in around a minute every time you start up the truck, Not a full size screen, but it makes room for a rotary knob, but even the knob has issues, its shiny plastic and slides in your fingers hard to grip and too stubby. manually dimmer screen at night
Hope this helps...
If i did it over again i would buy the panasonic time and time again if i was on a budget and didnt need NAV
I would buy the Alpine again and could easily deal with the few deficiencies, they are well worth the price
I would not buy the premiere (pioneer) again, although its feature loaded, it needs more brain power and better programming, if it was flawless i would brag the pants off this unit