How much RAM for a BungeeCord server?

Hi there,

I'm getting my Minecraft Network set up and I'm literally just about to buy another server to host my BungeeCord on. The question is, how much RAM will/should I get for this server?

I really don't have a clue. 250mb? 8gb? This has been puzzling me. Any help much appreciated.

- Ryan (Stereus)