The results I'm getting are around 240ms-390ms, the worst being Host Monster. The tests were run from the default Web Page Speed Test data center at Dulles, VA, USA. The S3 zone I used was "US standard".
How can we to the sub 100ms latency zone?
Here is a sample latency breakdown from Web Page Speed Test on Amazon CloudFront:
DNS Lookup: 49 ms
Initial Connection: 59 ms
Time to First Byte: 123 ms
Content Download: 28 ms