avids are supposed to be excellent if setup correctly
personally, on my trance, ive gone with full length outer for the rear mech,
because of the layout of the bike, it zips very tidly to the down tube, next to the brake line, through the brake clip holes, rather than around the whole downtube, and the rear triangle is black so a pair of small black zips quickly dissapears from view when the cable itself is routed inboard of the existing stops.
the top tube/front mech i jus run regular cable with outers between the stops only.
due to the last stop being open to the elements ANYWAY, and being located where it is, its much easier to unhook it after everyride and flush it through, i had sealed outers for a while, but because of the crap coming off the rear wheel, they only lasted a few months.