Not to bash you at all (actually i agree at a whole) but i voted for "better energy regen" because i intended it as "a better system for regenerate energy" and not "i want more energy".
Just to point it out As i said also in other posts, haste scaling should be taken out since it's the source of all the mad - we get to be incredibly slow at start and at the end we get so much energy we basically waste it.
BTW, the Assassination talent was Overkill - and i liked it a lot (well, i liked also the old HfB in Naxx when WotLK started, but it was a terrible design lol).
Energy regen should be baseline. Give every spec tool to regenerate it in active ways (i like to think SnD as a damage dealing finishers which works like envenom, buffing atk speed and energy regen) depending on what the spec actually needs.