You should consider using Global Crypto. They utilizes stenography and dual digital image confirmation that is done offline. It provides the only bi-directional, multi-factor, image-based Public Key Infrastructure (PKI) solution available today. And the best part, is that Global Crypto is affordable as well as user friendly. Keep me posted on who you end up with!
Most two-factor systems, including WiKID's, support radius Most VPNs also support radius, so if you need two-factor auth elsewhere, you can add it.
Another thing to thing about is using some form of mutual https authentication to thwart network-based MITM attacks. Mutual https is just any mechanism that verifies the ssl cert in some way other than relying on the user (because we know how that goes). More on that here: http://www.howtoforge.net/prevent_phishing_with_mutual_authentication and
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