Keys to the Kingdom is the only tour I have done. It was pretty cool, but nothing Earth shattering. The best part was going backstage an into the tunnels. I wan to do the Segway one in WS soon.
If AKL is too much, you might want to look at PORS or POFQ. They cost less and are simply stunning. They don't have the grandness of AKL, but are very relaxing and nicely done.