Most of these are just personal choices but I'll try:
-I always go best audio so that's a no brainer.
-Everyone I've heard that has drove a Gravity has said the Dynamic Handling package is worth it as it gives you rear wheel steering.
-I didn't want C&C pckg but am getting it via an orphaned order that had it. To me, this is the one option not worth much to me. But some people really want heated steering wheel and the auto-shades on the back doors. Good for kids, I guess, but I don't have young ones any longer. Heated wipers? Ha ha...sure.
-You said you were going to "adventure." In that case, I would opt for the power as those plugs will come in mighty handy if you ever camp, cook, tailgate, etc.
-I will never tow, ever. But you have to get tow package to even get the receiver that allows bike racks.
Good luck.