lol first off, worldstream is horrible. They have alot of network downtime and the support is ****. The employees are rude, and they bow down quickly to any publisher who says you are infringing copyright. I do not suggest them.
Also that system he suggested is much too expensive for 200 players. You can run 200 players on a 4-6 GB system assuming you want 4 channels. You also will not use 10 TB traffic...
I have a root with 24GB DDR3, and an Xeon water cooled CPU, and 1Gbps connection. The server is in france and I am not using all the ram. If you like you can rent from me for very cheap and I will host your server on it.
It's running 64-bit freebsd 8.2
Also i7 are desktop cpu, Xeon are designed for hosting servers