17 black guard - 316
musician
standard bearer w/ hag graef
champion with crimson death
master 138
soulrender
pendant of khaleth
heavy armour
sea dragon cloak
I've seen this unit stop through virtually anything you can field at 1000 points. Sure, it's almost half your points, but with 3 groups of 10 repeater crossbowmen and the 20-man corsair group, it's a very nasty thing.
ASF+stubborn is fantastic, because you can often wipe front ranks and even if you lose to
CR, it doesn't matter. The champ w/ crimson death explodes even weak heroes (and obviously other champions), and the master is an unkillable jerk who packs 3 hatred+
ASF S6 armour piercing attacks
I'd replace the warriors and the sorceress with the black guard, then find a spot for the ring of hotek (like a Cold One Knight's champion), and you're golden.
Granted, this is me butchering your list into one I find more pleasing, so I appologize

I'd like to see your corsairs packing the sea serpent standard since I have a soft spot in my heart for 3 rerolled attacks per model (forcing almost 7 saves on WS4+ T3, or 4.5 on WS4+ T4), but it's far from mandatory.