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Your best option when figuring in cost/weight will be Alconite K guides probably starting with a 30L and dropping fast to size 8 or 10 runners.
For that size spool you can build something a bit lighter that will cast as well (but not necessarily better) using Titanium LC guides (20-12m-10 into 8 runners) but the expense is substantial (@ $180 for guides). Regular LCAG guides are heavier and I'm not sure they offer a big advantage over K guides but they are pretty cheap for the three sizes mentioned and you might consider buying three to try them against the K guides and see which you prefer.
If you decide to try the LC route pm me and I can give you some guidelines on where to position them as a starting point for test casting.
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