I love using silk thread for my satin stitch. I have managed to accumulate quite a collection! I like YLI silk thread and I use a size 60 needle. (Word of caution: most needle threaders on machines will not work with the 60 needle so you have to thread manually! - Now doesn't that make sense that the smallest needle can't be threaded automatically!)
I use an embroidery thread in the bobbin because it less apt to cause tension issues with the silk thread.
Try some practice pieces and have fun!