6-8 lb always, that's as light as I'll go for anything really, except trout.Even the bluegills get 6lb, they hide in the weeds!
Historically, I used 6 and 8 pound stren with mackdaddy since we fish the same lake, but I'm thinking of trying fireline this year, the 10lb./4lb. diameter kind. Does anybody know if walleye are lineshy, and if so, what kind of floro leader do you recommend?