lol first off, worldstream is horrible. They have alot of network downtime and the support is crap. 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 :)