In multiple faction games I don't like to be stuck to just one faction - I always like to create at least two forces/decks/lists/armies/whatever, so that I can support a 2 player game, even if my opponent doesn't collect or play the system.
I also don't like to 'pin my colors' onto any given faction, because what if they don't fit my playstyle eventually?
So currently I'm aiming to make a decent force of all 4 factions. Is that totally unrealistic? I don't HAVE to have all the options for each faction - will probably aim for 300 points of each.
I've got 2 cores preordered with my FLGS, so I'm ending up with around 100 minis and around 200 points per side. Buying x1 of every other expansion will give me around 300 points per side.
I just wonder to what extent do people think we'll need multiples of any given expansion? Will I really ever need more than 3 rune golems for example? More than 3 cavalry units?