The kicker on our boat has been spliced using standard braided 12 strand SK75 Dyneema rather than the more expensive SK78 variety. The first cascade is made from 5mm, and the 2nd and 3rd cascades are spliced from 4mm. The control lines are then 4mm dyneema core control line. My theory was that the first cascade has the most load so go big, and then the 4mm was substantial enough for the remainder of it. Don't underestimate the amount of purchase you require so go big!