This is the second-latest in my Borealis rocket series, and the current standard. With a Duna/Eve/Laythe universal lander, the rocket gets ~10,500 delta-V; probably not enough for Laythe (though I've not yet tried), but enough that I've run several one-way flights to both of the former. Cut-down version without the SRB clusters acts as a short-range satellite deployment system. Standard overengineering and poor optimizing, but it works!