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EB Cobalts are quite wallet friendly, so
start there, and very likely finish there.
I have never tried the 5-string set, but
if I ever did buy another 5-stringer [not
very likely] my experience with 4-string
Cobalt flats would lead me to follow my
own advice as offered above.
IOW, I'd definitely risk the price of a set,
cuz if the 'B' is as great as the 4 others
then it's a dream outcome. And if the 'B'
were not what I'd hoped for, I still have
the 'EADG' set, that I already know and
love, for use on some needy 4-string
FWIW, they are on my fretted USA SUB.
USA SUBs, IMNSHO, are the progenitors
of the Classic series. But mine is crackle
finish black, so I am only guessing how
Cobalts will sound on Lake Tahoe Blue.