Hi,
It looks like an Amazing setup!! Really.
I dont think it'll come close to nellie, but it'll need a new Motherboard if you upgrade to Nellie.
It does seem very expensive though, especially when you could get fairly similar performance for a lot cheaper.
If you can afford it, you'll have a great setup, but will have to fork out again and probably have to reinstall everything with a new CPU & Motherboard.
Somebody more technical than me will give you better advice probably.
Rik