There won't be a lot of extra, if you start with 40 ft. I know it sounds like a lot, but a CRL (when used with large trees or a long span) will use up quite a bit.
Mason line is fine, and quite inexpensive. It 'can' be braided also, but not as easily (IMO) as the other options. The drawback is that it isn't that durable over time, and tends to tangle if you aren't very careful with it. Some folks don't mind that, though, and consider the low cost to be the trump factor. HYOH!
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