You have a few options
1. Move to a different VPS, those specs there aren't that impressive, 68MB of ram isn't much, the 100MB/s connection is over kill, and that isn't a very power processor and 2GB of hard drive space could be filled within a few weeks.
2. Optimize your VPS, post in the server configuration options over at vBulletin.com
3. Upgrade your VPS further.
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