~where not specified, assume it's a PvP perspective...
Overload - Probably a style thing, but I love having a 3rd skill bar. I prefer this, to having a better nuke-ability. Yes, if I were asked if I'd rather have the 3rd skill bar or Standard of Might, I'd take Standard of Might w/out hesitating. Otherwise, I'm grateful I've 5 more skills within reach than other classes (during combat & after charged).
Negate - Yes, a properly used Negate in group PvP is of extremely high value and I'm more than happy to be the negate-*** if that's my best contribution towards wiping an opponent. Having said that, I would certainly welcome a few small tweaks from ZOS to this niche-ulti such that it was more on par with the likes of DK's standard, NB's veil and Templar's Nova.
...Atronach - I've heard that ole stormy comes in handy for adding DPS for end game PvE. I wouldn't know
Non-Sorc options
Soul Assault - Yes lots of damage, but it's also survivable and sends out a flare to all enemies saying please come kill me
Flawless Dawnbreaker - Very nice if you're aiming to boost weapon damage. This may work well for your build. I use this as alt approach on my NB when playing dedicated PvP DPS role in group and change it out to Resto when solo.