I have four credit cards each with credit limit above $20,000. I use only one of these high-limit cards, along with one or two other credit cards with limits much much lower. My monthly statements are seldom above $400 to $500. My credit rating is above 800. Since I foresee no more need to have such high limit I am thinking of cancelling three of these high limit cards. Is this a good idea? Will this affect my credit rating? Any suggestions?