You ceiling may be too complex, but they have ceiling tile that doesn't use the standard drop, the tiles are held by flexible strips that allow the tiles to be popped in (the track is flexible, in other words, and is screwed to the joists). It basically doesn't take any space, and allows easy access above it. My basement ceiling is low (7'), and what I did was use tongue in groove with screws (If I need to get to something in the ceiling, it isn't that hard to take down). if instead of tongue in groove you used thing boards and screwed them into the joists (ie the boards touch but don't lock together), you can take them down if need be by unscrewing them. If you stain/paint the wood, the screws will be the same color so won't stand out.
