My Delica (just picked it up yesterday - YAY) at stock height (I believe) measures 6'-3" at the gutter line and about 6'-7" at the rear spoiler (not all have one). A lot of parkades can be as low as 6'-8" and commonly 7'-0". BC Ferries underheight vehicle limit is 7'-0". That said, as soon as you add a safari rack and/or light bar, the vans will exceed (pardon the pun) the height restrictions so... again, go big or go home is the question. The Crystal Lite roof looks luxurious and cool but is heavier and will require repair at some time in it's life plus the extra equipment eats up the added height very quickly - my low roof has a nice big moon roof in the back that opens up for as much air/light as you would desire plus the big side/rear windows provide an aquarium-like feel anyway. I am 6'-2" and can sit in the back seats comfortably with out feeling cramped by the low roof. If it IS the extra volume you desire the high roof without Crystal Lite makes a huge difference but again you are dealing with a vehicle that is physically much taller.
The Cham version didn't do it for me - perhaps I didn't see the right one - the stripes are part of the character of Delicas (all appear different in some way)... the Cham carpets tho...

I have two TV's in mine and will be posting a question of my own after I'm done here. One note we did discover is the Sony LCD is somehow tied in with the ignition and switches the TV off if the vehicle is running (only stays on when using the accessory mode of the ignition). The wiring is a messy job in mine so will need to look at that.
Hope that helps.