^^^^^ This a million times over. Do not go cheap on a headunit. My single DIN, non 7" screen, non DVD, player cost more than that unit does. That should tell you something.
When I bought my first ever headunit I paid $50 and it lasted 6 months. I paid $180 or something for my replacement and it lasted 7 years. I paid $200 or so for my latest and it still was perfect when I pulled it from my Stealth. I only pulled it because the car is parked for awhile. A 7" screen DVD unit like you want will be around $500 for a quality unit. If you only want to spend around $180 get an Alpine single DIN.
