I am so tempted to get into HACKS, but have resisted so far. They do look great though. Those skeletons are right up your alley Dan!
The Greek stuff really did not do much for me aside from the Skeletons and snake bodied Gorgons, but the next Series due early next year is fantasy based so I will be buying tons of the Orcs, Knights, Barbarians, etc.
After that is the Retro Space series which pulls its inspiration from 50's and 60's sci-fi imagery (lots of jet packs with fins, bubble helmets and ray guns
).
Series 4 is Pirates Vs. Merpeople which will be awesome!
They are a bit pricey at $20 for named characters, but they are worth every penny as they are SUPER articulated and have some of the best paint apps I have ever seen at this scale. The Boss Fight Studio crew are all former Hasbro designers/sculptors/etc. so if you like TVC era Star Wars figures or modern (25th Anniversary to now) G.I.Joes, then you will love these figures.