Tekkitear

Alright, I'm planning on hosting a server. The server will have on average, two trough five people on it at all times It's going to have no plugins, as it is a private server What specs should I get? How much RAM? It's going to be a big world, most likely loaded 10,000 blocks in each direction Also, are there any machine, animals, or otherwise things that cause the server to lag or crash? I am opting for 1 or 2 gigs RAM.