I own some rtu in my roth and was looking to add another of the cns closed end funds for income. I know usually you look at the discount to NAV value to pick a fund but is there anything else like ROE or book value that might be helpful? I am looking at RNP and INB most because one pays .20 and the other .17 a month divy. Most important thing is the safety of my investment of course so anyone own other CNS funds please reply. thanks in advance.