i have thought about an MX7000 as it is an excelent lightbar, but there are two main issues(Besides cost)
1)You will need to cut a hole in your roof, and if not completley sealed, you are lookin at rusting and leakage onto your head - not fun
2)aestetic value - some people consider a lightbar ugly, whereas hideaways are out of sight until you need them. right now i have hideaways (flatlighter and some wigwags - gettin more deck lights soon)and they work great.
i guess its all an issue of taste. if you do get the mx7000, youre going to want to go with the 47" lightbar, not anything larger. i have a 48" arrowstick and it stocks out over the sides of my hatch slightly