I assume that your 930 has screw in chokes? Correct?
If yes, an improved cylinder choke tube will work well for slugs and buckshot. (I don't advocated using birdshot to protect your family with unless you're being attacked by a swarm of birds).
As for range days for skeet shooting, I like a good old fashioned MODIFIED choke. They tend to be nice middle ground to give you enough spread to be able to do well with clays, and tight enough to give you a little more range to get them than a skeet choke, but that's just me personally.