I use a 3mtr x 6mtr roll of white vinyl (about £10/m from marquee makers) it is heavy as said but if used alot then paper just becomes soooo expensive to keep throwing it away. Just make sure your support system is heavy duty
As for colour, I'd go with white as you can always gel or turn off the BG lights for creative work.
Agree with that if staticJust use white gloss tile board for the floor and light the grey background to white.