Every nefarious cult starts with an equally villanous Magus! I chose a Fishman Demagogue for 12RP and decided to keep him equipped as is. With his decent Resolve and good close combat bonus, he's pretty "killy" by default and causes great damage. I normally don't risk my Magus in game too often, as he prefers to get the congregation to do his dirty work, but he's dangerous and most players will avoid him regardless. The fact that he is Hideous also means that I don't really need to worry about getting mugged in close combat by any mooks (and they aren't good shots either!). He'll need some cronies to boss around, but for now he can be pretty stock.
Total Cost: 12 RP
I like being able to have the freedom to move as many models as possible in a turn sequence. A Cult Leader at 5RP fits the bill nicely as he has a great Resolve stat and the Command skill. I'll arm him with the standard .22 pistol and Bowie knife combo for his basic survival needs and a Rainment for 2 RP, which will give him save against shooting and close combat attacks. Much like the Magus, he's going to hang back and focus on what he's good at...bossing lesser minions around.
Total cost: 7 RP
Now that I have 2 Command models, I wanted something that will be the wrecking ball. The new 14 pt Deep One model is big, tough, intimidating and wreaks havoc but is a hefty investment. He causes Fear and is Hideous but as a Beast cannot be armed, search or hold objectives. Not that he will have time for that, he will be too busy cracking skulls. Also by having the Deep One in my cult, he'll be garnering most of the attention, leaving my other mooks free to mop up the spoils!
Total Cost: 14 RP
Speaking of mooks, I'll round things out with 3 Cultists. One will be 'stock' with a Bowie knife, one will have a Bolt-Action Rifle and one will have a Tommy Gun. Both Tommy Gun and BA Rifle variants will have clubs as their common weapon, so that no one is defenseless if charged. The Bolt Action Rifle allows me to pick off enemies at great distance (like Cult Leaders or Serpentmen) while the Tommy Gun gives me enough shots to hopefully compensate for Cultists' poor shooting.
Total Cost (3): 7RP
40 Resource Points well spent. Time to throw down!