If you want a solid infantry block to hold ground and provide an 'anvil', then I'd seriously consider a Ministorum Preacher - Zealot is a superb rule, making it almost impossible to break the unit short of killing the unit to the last man, and as an independent character the preacher has a 2+ 'look out sir' in addition to his rosarius to protect him.
Plus hatred and 'the Emperor Protects' even makes the unit vaguely half-competent in assaults if you get lucky...
Leave the heavy weapons at home - or at least in the heavy weapon teams - as you're going to be moving as often as not. Grenade launchers and flamers are cheap - the latter complements lasgun fire well and the latter en masse provides scary overwatch fire.
One or two sergeants with meltabombs aren't a bad plan. Two or three meltabombs are generally a better investment than the same points spent on general-issue but weaker krak grenades.
You could issue power weapons to take advantage of hatred as well, but you're paying a lot and it still won't necessarily make you 'good', just 'less awful'. That said, if you plan on and manage to get the charge, 30+ guardsmen on the charge with hatred can do more damage than people give them credit for, and 12 reroll misses power axe attacks can hurt.
I'd suggest company command squad, a 40-odd man combined squad with a preacher (or two), and two to three heavy weapon squads armed with whatever you feel best complements your bike squads. Mortars aren't bad, if only because you can hide the vulnerable unit from the enemy.
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