Just be clear, the list doesn't have to have dedicated models in your collection. For instance my minotaurs, which don't even have an active EA list, are able to be fielded under 4 separate lists (iron hands, codex, SoI, and Crusade). Actually I;m pretty sure that if I cared to bother, I'd be able to fix another few lists in there too. I plan on adding IF capabilities by adding a few thunderfire cannons and a formation of Achilles to the collection and in fact, those will be painted in Blood Angels colors! So in no way does color determine force, nor do you have to be uniformly colored (a mixed task force). Your collection can become fairly modular very quickly by simply additions. This means that in no way, for instance, would one list "consume" your rare hunters and tbricks; They can be used repeatedly.
Perhaps instead you're wanting two armies in your collection, Space Puppies and Inquisitive Guys. Well that's something I'm sure we can help with but not really pertinent to lists as again you can reuse your space wolves tanks as the armored core while the GK fly on to smash shit up.
With 5kish of troops you should be able to create any number of list compliant forces and likely several variations therein with the vast majority (80%ish) being common and still have models left over to trade!
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