As expressed in the title, I am in need of a Visa CC with a great signup bonus that will allow me to put points towards DL. I've currently got a DL Gold AMEX card, but I would like to add a Visa CC to the mix.

Also, is it common/safe practice to cancel cards that you have to resign up and get the same bonus again? If possible, would consider doing this with AMEX. I have had the card for over a year now. Thanks in advance!