I use 3/8 for the sheets and 7/16 for the halyard, however I have a new Sampson Xls extra jib halyard and would use the 3/8" xls extra if I were doing it again. Plain dacron double braid is fine for the sheets and 7/16 dacron is cheaper than the low stretch stuff. Unlike jib and main halyards, the stretch isn't as important on the spinnaker.
If you want performance reaching, you need an adjustable tack. I rigged a 3:1 led to a cam clete on the side of the cabin near the cockpit. A single line extends from the forward block to through a single block attached to the anchor roller structure. I'd probably do a 4:1 if I were doing it again but it works very effectively and permits about 6 ft of tack adjustment. In smooth water, letting the tack off will let you go much deeper downwind.
If you want performance reaching, you need an adjustable tack. I rigged a 3:1 led to a cam clete on the side of the cabin near the cockpit. A single line extends from the forward block to through a single block attached to the anchor roller structure. I'd probably do a 4:1 if I were doing it again but it works very effectively and permits about 6 ft of tack adjustment. In smooth water, letting the tack off will let you go much deeper downwind.