The real answer for your problem is one reel for one fishing situation.
100m 10lb, 20lb, 30lb reels for really inshore use
200m 20lb, 30lb, 40lb reels for banks use
300m 30lb, 40lb 50lb for reels for off shore use.
However, can't see it being practical
Also as Neal said, it all depends on how you fish, I tend to use much lighter lead so I can really keep the bait on the move, so I tend to have more braid on my reels.
Experiment for a season or 2 and see how it goes.