I would Stay with Linuxmce.
I have 80gb hard drive on which core/hybrid system installed.
I have another 1 TB hard drive formatted as xfs (I believe) (I dont remember) which is partitioned as LMCE directory structure. If needed I can just upgrade the towercase that can hold more drives. but I think, for now LMCE fulfills all needs for directing media with much less system requirements. (Except Mediatomb can be more user friendly
If you need to reinstall LMCE that goes on 80gb but the media drive would be plug in play
As far as I understand, Core does not need more powerful system, its your MD needs all juice.
And that is pretty true,, as I run my core on old dell poweredge S420 with pentium single core processor with only 2 gb ram. and it works. except with slow orbiter regen