Jim, From my experiences over the years, as an example: Have used the V700 on 34' sedan bridge and a 25' Rosborough. I've used both 3 strand and 8 plait line. Both worked fine with the Lewmars. Big advantage with the 8 plait is way way fewer hockles to contend with. That and a good swivel makes retrieving the anchor a much more efficient operation. I also used the rule of thumb for rode length, that is 4 or 5 to 1 if a calm night expected and 7:1 ratio for wind conditions on Lake Champlain.
I also favored the CQR anchor, but that of course is my opinion. So if you anchor in max of 12'of water, then add 5' (to be on the conservative side)from bow to water it seems that about 125 - 135 feet of rode would work out. I also like the old rule of thumb of having a boat length of chain. I assume you have a 30' boat?
Enjoy your time on the water.
Ron