definitely pen mode for me. for the tablet a mouse mode makes no sense for me. just imagine I would try to shade in mouse mode

instead of hatching one area, I would drag my cursor further with every stroke. and I would need to constantly reposition my cursor
By the way, I think if you just call them absolute positioning or relative positioning, it should be clearer what you mean =)
I started on a 4x6 tablet, too, and was worried if I could adapt to the 6x8, as I draw much out of my wrist, but I really love it, and I think I am finally improving my drawing habits my drawing more with my arm. I 9x12 would probably be too big for me, but the 6x8 seems pretty ideal for me right now
