1 x 32GB or 2 x 16GB

So far, I have three sd memory cards for my DLSR camera now. I have a 16GB, a 2GB and a 1GB SD memory cards and thinking to get a 32GB SD card if possible. I am still checking on the price as I am not sure it would be good to get a single 32 GB card or 2 x 16 GB cards. Still have not make up my mind but I think I will get the price firs and decide later.