Haven't used the Z-packs stuff but I have used 1.5mm Stein Skyline, that's good single braid dyneema, very easy to splice.
I get the 1 and 1.2mm fishing line from here,
http://www.ebay.co.uk/itm/221705842285
It's single braid, 8 strand I think, but it is nearly (but not quite) impossible to splice. Tightly braided,you have to spend a lot of time loosening it up enough to feed a splice inside. Life is too short to bother, with a 300lb break strain, I can afford a knot or two.
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