Yorick is still not that good, his best utility is pushing and ulti that can turn game tides but other solo top laners are way better (irelia to name one), and he is one of champions who according to most people don't deserve 6300 at all.
Moakai is a tanky mage, like chogath, except his 20% reduction is great, too bad it need people to stick to a spot (but its still great)
But if you hate tanky types (or got enough already), then don't get yorick/moakai/swain, Malzahar is too squishy imo, and not the highest dmg for a dot mage (most his dmg is dot, not instant, and since his survive is low it isn't that good idea)
That left us : nocturne/thrundle : melee who can also jungle (a bonus), cait : a painful laner and good carry, vlad : also heavy nerfed he isn't bad at all and can hold himself quite good, just not from lvl1, his utli can turn team fights
I'm strongly against tanky type of this list, since you said you got tanky ones already (probably you want people who deal massive dmg), so noc and cait are the ones who deal most dmg in this list I think, Thrundle is jungler but a TANKY dps more than noc