I find it funny how I haven't said anything on here in awhile and you still address me, for I am everywhere. The patron saint of league. lol
Though for the record I wouldn't really consider Morgana a real nuker, shes a bit more utility based despite the fact she can kill pretty fast if she gets farmed (and she farms real easy if you just speed level tormented soil and drop it on minion waves). Veigar/Leblanc are examples of nukers, they blow out huge amounts of damage in under a second and don't really give time to react whereas morg's ult and puddle of black goo give you some time to flash out or cast heal to save yourself.
That's all irrelevant though if you do well with her then that's all good. If you like her style you may consider trying out swain.