For long lines I do not use leader material. I have always felt that the stiffness of the line would take away from the action of my spoons. I also like the stretch you get with the non leader material. Flies on the other hand always get fluoro leaders.
If you haven't checked out the reel fill calculator on the site you should take a look, very helpful for setting up reels. I typically like to have 200 yds or more of backing on my copper and leadcore setups.
Even though you may not use them all the time is is nice to have the extra rod holders when you are moving rods around on the boat clearing a space to net fish.