Join Date: Mar 2007
Location: New England
Thanked 7 Times in 7 Posts
Rep Power: 9
5/8 is plenty for your boat. Since your home marina requires it, just get it. I would get the enough for at least 6 lines total; 2 spring, 2 bow/stern and 2 extra long bow/stern. For lengths, 2x boat length for spring, 1x boat length for bow/stern, and 1.5x for utility lines.
If you liked my advice/response, give me some rep points. If you didn't......well what do you expect, it was free.