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Actually my choice of list would be Mass Sisters with double meltaguns or h.flamer+flamer in Rhinos backed up with Deep Striking GK Termies.
This lets you hit the opponents with meltas in Turn 2. If they charge the Sisters they leave themselves open to a GK Termy countercharge. The biggest weakness of the SoB list is that they are weak in CC even though they are a close-range list. GK Termies weakness is the inability to damage vehicles and getting shot after Deep Striking. Seems like a perfect match.
Probably something like 4 Rhino squads with 2 5-man Termy squads should work well.
~dances with self~ Imagine. A fully =][= list. It would be BEAUTIFUL.
This is the same thing I have been trying to figure out if it would work and came up with a possible solution. I am planning 2 Storm troop. sqd. in Chimeras, 2 SOB in Rhino, (these help in a mission based game) ILord with GK retinue or (ILord with peons), 2x preachers with sob sqds., Callidus ass., GKnights, 2x DCAss., Seriphins, 2x Exorcist, Orbital strike or (Immulator). Feel free if this looks good to you use it and let me know. This army should keep in comp. for tourny play easy.