With only two top kits you are a bit limited for choice, but I use the Maver dual core elastic size 12-20 in one of my tops which if not set too tight will handle skimmers as well as bigger fish although a 24lb fish might take a bit of handling, alternatves may be black hydro or any of the other hollow elastics.
I also use pure latex in a size 12 for fish to around the 6/7 lb mark again it seems fairly forgiving when hooking smaller fish, the alternative would be white hydro. I have had no problems with the 12-20 dual core which is now getting on for 3 years old although I have remade the stonflo connection a couple of times by letting a couple of inches of the winder bung.
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