Do you plan on using this rod more than the other rods you already have (i.e. your "every day" rod). If so, I think the versatility of the GSB 120 1M is a great choice. If you're building this as an eeling stick (realizing you may also throw plugs) then I think it makes sense to consider some of the other suggestions people have made (the super surf, etc.) as they may fit that application a bit better than the 120 1M.
I don't fish eels all that often so I can't opine as to which would be the best blank for the specific application. However, if versatility is what you're aiming for then I think a 120 1M is a pretty safe bet.
Just my $.02
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