most places around here would have attomic or blood run copper in 45 lb test and both are good, i have attomic.
i order 30 lb from the states from cabelas they sell afw since you can no longer get opti. i think you would like 300ft of 30, it would have you around 70 to 80 down at 2mph with a spoon. with cow bells you would not get that though, you might get down 60 65 ft.
i like copper over riggers because you can pump the rod while trolling, it's work but it catches fish
beaware copper is a bit of a bit ch and you have to let it out under tension. free spool copper and you will regret it