The link in your signature doesnt work so I couldnt check out your website but will be helpful if you can answer the following Q's
- Whats the size of your DB (Are you storing attachments in the DB or as files on the server)
- How many of the 400 users are registered members / guests
- How many modifications / styles have you added
Based on this info, I could recommend a semi-dedicated vs. dedicated server
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