Actually you didn't even pick the best benchmark. Almost all dedicated servers support AES-NI which can make a staggering difference to your site's SSL performance. This is not available to EC2 AFAIK.
It should be noted that the AES-NI TLS speedup only occurs if you are using AES. If you are using RC4 (Google and Facebook use this), you won't benefit from the new cpu instruction. Here's another useful TLS benchmark I came across:
http://zombe.es/post/4078724716/openssl-cipher-selection