[Dravenguild]

I may not be an expert at these sort of things, but if his entire army is a battlesuit army I'd imagine that its fairly flexible and versatile to lightning strikes.

If it includes heavy tanks and skimmers like piranhas, The most logical choices in my opinion would be to take a beefed up squad of Havocs, perhaps some more raptors with the mark of slaanesh or nurgle so they'll be harder to wound or strike faster.

Obliterators i think are to fragile in this matter but it depends on how you use them.

To tie up those crisis suits maybe full squads of berzerkers or plague marines to soak up most of the heavy resistance.

But the best way is probably more rubric marines, their AP3 will shred anything except tanks and broadsides, even if they get charged they strike simultaneous with crappy tau. Not to mention the sorceror and his force weapon will rip through those expensive suits.

top it off with a 4+ invul and they will keep on a rockin in midgar.

So take your pick, shooty or teeth gnashy.

The best HQ to hopskotch those pesky broadsides and tanks would be a bike lord with mark of nurgle, melta bombs, power or daemon weapon (I'm not sure if a bike can take daemon weapons) and anything else useful.
and a Lord with wings melta bombs and