Live streaming / bandwidth

Hi there, my first time here.

We have an account for almost an year now, everything is fine. But we do a lot of live streamming on another server, and we are thinking of bringing here all of that. We would install our flash media server here, if:

How many people online can DreamHost hold simultaneously ? We stream at 250kbps, and we would like to have a thousand people seeing. In our other host, we have 100 Mbps, and we can have almost 500 people simultaneously.

Should we had another account, just for live stream? This “unlimited” bandwidth can hold it?

best wishes,