Advice for a 2nd list to complement pButcher

[swirly]

I like taking this pButcher list:

The Butcher of Khardov* +6 points
* Spriggan* 10 points
* War Dog* 1 point

Gorman Di Wulfe, Rogue Alchemist* 2 points
Harlan Versh, Illuminated One* 2 points
10 Kayazy Assassins* 8 points
* Kayazy Underboss* 2 points
Kovnik Jozef Grigorovich* 2 points
Lady Aiyana & Master Holt* 4 points
Saxon Orrik* 2 points
10 Winter Guard Rifle Corps* 8 points

I'm pretty happy with it and used to it now so I don't need advice on that.
What list/caster/choices do you guys think I need to plug the holes that this one doesn't fill?

[Saekyn]

I usually use Butcher in hard-hitting lists, myself, but this one seems a bit low-powered. If it works for you against lists with lots of heavies, like Skorne lists, then I'd say go for one of the Irusks or Old Witch. p.Irusk is a good infantry-support caster, and is great for attrition fights and objectives. OW is pretty good with scenarios herself, and loves to slaughter her some infantry.

[swirly]

The reason why I love this list is because strangely, no one expects POW 15-17 weaponmasters at mat 9 taking down their heavies. Most heavies get taken down by 3 charging kayazy's. I normally jam them as far as I can down my enemies throats and if baldy survives the next turn, it's usually game over.
Butcher doesn't really need heavy hitters IMO.

[scout's honor]

I don't think cracking ARM is usually an issue with pButcher, especially with A&H thrown in the mix. I'd be concerned against lists that can deal with high DEF infantry though - you're fine as long as those Kayazy are there, but if you lose them your damage potential goes way, way down. That'd be my obvious priority for a complementary list: something that can stand up to anything that'll threaten the Kayazy.