Well, seeing as I am fighting Tau, I kind of want to tailor for Tau, yea.
Anyway, seeing as he is expecting me to go assault-heavy, I figured it'd be a good (and fun!) idea to do what he least expects: Have half my army stay back and shoot little holes in him. Luckily, Scouts with great cover saves don't care about Strength or AP - they care about things that ignore cover saves, which he won't be bringing, seeing as he is expecting something to come to him.
The MotF was the only HQ option worth considering for this job - everything else needs to be at least within 24" and LoS to be effective (maybe besides the Chapter Master, but I'm trying to keep within reason). The MotF provides +1 cover, at least.