This may sound crazy, but I always go E first, W 2nd and Q last. The stun is key in how I play and a longer duration on the stun/slow only helps add time for ganks to succeed. Combine that with Sheen's procs and its a VERY painful 1, 2 combo for any other top lane bruisers who try to go in for some poke.
At the very least, Q should be last on the list simply because with a sheen and your ult, you will have insane damage output at early/midgame, and a lesser cd and mildly increased damage on your dash mean a lot less than a more powerful stun and the health return.
But that's just my play style, so take this advice with a grain of salt.