Since I haven't posted in a while and there doesn't seem to be a good Nova build I decided to post mine.
This build focuses on team support while being able to survive nearly EVERYTHING.
This build effectively uses Redirection, Vitality and Quick Thinking to keep up and running. Combine it with Primed Flow for massive results (743 Max energy thanks to Nova Primes larger Energy Pool).
100 Energy = 240 Effective Health with Quick Thinking
743 Energy = 1783.2 Effective Health with Quick Thinking
Add 740 Health for a potential total health of 2523 with 740 Shields.
On top of that you also have 154% Duration from Max Narrow Minded and Continuity to give you VERY large Mprimes. You'll only need to run intensify being as there is a cap on how slow enemies can get, (Max is 75% speed down, with Intensify (30%) and base of 30% you'll get a slowdown of 60% speed). Lastly a Streamline to bring the cost of each M-prime down to 70 energy. With a 743 energy pool, 70 energy for an M-prime should not be a problem, (will replace with maxed Primed Streamline (55%) if it ever comes out, for 45 energy M-primes).
So basically if you're going down with this much health, shields, and M-prime active, something is VERY wrong. However all in all this will be a great addition to almost any team, being a power house that refuses to go down via the combination of insane health and constant M-primes.
(For Fast Nova just replace Intensify with Overextended)