I've been using colligen, no special storage needs, no pre-rinsing or soaking. Not sure if they're the best or anything, but for the beginner they certainly are the simplest. I've only used snack stick sizes so far 19-22mm, and have had a couple batches where the cases did not adhere to the sausage very well and just peeled right off. The last stuff I made, a batch of Kabanosy, I hung in the basement for almost a week, and they were bonded tight, no problems.
I'm finding the whole sausage making thing to be a great learning experience, even horrific mistakes end up tasting not too bad!