Throwing more ideas around - an assault section based around a Crassus carrier. M10, 20W, T8, 3+ save. Transports 35 models. Equipped with 4 heavy flamers that can shoot after advancing. 270 points.
Now, load that thing full of 9 Bullgryns, a Priest or two and Straken. A Hellhound or two to go with it. Maybe flank in Roughriders to benefit from all those bonus attacks as well. Guard CC carnage!
Straken 90
Ministrorum Priest 35
Ministrorum Priest 35
Bullgryns (9), 9x maul, 5x slabshield, 4x brute shield 378
Roughriders (10) 2x meltagun 120
Roughriders (10) 2x meltagun 120
Hellhound, heavy flamer 110
Hellhound, heavy flamer 110
Crassus armoured assault carrier, 4x heavy flamer, stormbolter 270
1268 points. Still leaves room for ample fire support. And those Bullgryns dish out 55 S7 AP-1 D2 attacks on the charge...