"Also do you have any suggestions on suitable bivys?"
Welllllllll, sure! The Mountain Laurel Designs Soul bivy, available with a side zip to make getting in and out easier, is a great bivy! Used by many on this site.
And wouldn't you know it, I happen to be selling one, new, never used, at a great discount! See here
Also, the Titanium Goat Ptarmigan and Raven bivies are very well regarded by most. And cheaper, too!