I will add that couch lock is a relative thing. I smoke Maple Leaf Indica, GDP and Black Domina or SAD as it is called, all the time. None of them couch lock me very much.
I can go about my affairs with no problem. If I take a little too much it passes in 20 minutes or so and still can function ok. I call them sit still highs, as I can sit still easily. Not really stuck to the chair though.
SAD might be the strongest but I just recently started using it so tolerance could be going on. All of these strains will provide a very pleasant high, not just strength.