So what about a Minecraft server? We need to decide what would be the best option for it. In case you don't know, FTB and Hexxit are custom servers (modpacks) which need a medium performance computer so it can support it. FTB is heavier tho.
Hexxit and FTB (MagicWorld 2 would be the best option here) are basically the same, but FTB has more option so it's more complex and fun to play.