If you get the chance it's completely worth it. Make sure you guys camp at the BLM campground, not oasis or whatever the other one is, they are too far away from the good stuff. There are lots more razorbacks and big dunes than at LS, and bowls like crazy. The bowl in the one vid that my wife is hitting on her Z is enormous, we were hitting 60+ mph around that thing according to the GPS.
IMHO, for all-around duning, St. Anthony kicks Little Sahara's ass. If you just want to race the hill, LS is where it's at. There's more pics and video to check out at dunereview.com, most of the stuff is kind of outdated, but still gives you a good idea of what to expect.