I'm not quite sure why you'd want to host this on a VPS. Something that's important to note is that many VPS providers will reuse IPs, meaning that even if you get a static IP it likely isn't the first time that someone has been issued this IP. Many spammers will utilize VPSs to host mail servers to send out spam emails, which results in a lot of these IPs ending up on blacklists.
EDIT: Didn't realize this thread was very dead. My bad