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First, I'm assuming that there are both network and client firewalls between the servers on both ends of the connection. If this is not the case, definitely revisit the network topology to determine if this type of basic Internet shielding can be implemented. In the case you describe, the firewall protecting the server should be configured to allow traffic only on that single required port from the single IP address of the remote server.
Next, consider the confidentiality controls in place. How are the two servers connecting to each other? Are they using SSL or another secure, encrypted protocol? If the servers are using a secure protocol, a VPN connection may add unnecessary overhead to the communication, as each message would be encrypted and decrypted twice. In that case, skip the VPN. On the other hand, if you're not confident in the security of the encryption used by the client/server protocol, an IPsec VPN configured to use strong encryption is a safe, reliable choice.
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