I am planning to buy a server but I have 2 questions. 1.) What does the number stands for beside the plans? Are they RAM or storage? Like the air plan of 256 MB. Is that 256 MB of RAM or 256 MB of storage? 2.) I am only buying the server to play with my friends (3-4 people.) I would like to install some mods. Just a few like NEI, WAILA, Classic Combat, Drawer Mod, etc. I wll not be installing any plugin. Is the grass plan enough to run smoothly?