FWIW: Amazon's Micro instances will burst to saturate unused CPU cycles on the host machine up to a hard-capped limit before being choked to death by the hypervisor. Had he run the Blitz test for 10 mins or more you would see the spike in traffic up, beyond what you think a Micro should sustain, and then it plummet to near 0 for a disturbingly long period of time[1]. If you are unlucky enough to have a Micro on a hos…
I only picked the micro because it's cheap, and AWS let me fire one up, build the config, break it, trash it, and start again, all in rapid succession.
One thing though, this configuration doesn't actually need much real CPU or disk resources - it's pretty much all memory, and as far as I know, AWS doesn't overcommit RAM. this means it should be "relatively" stable. The CPU usage is at around 5-10% even at the peak.
Personally, my own blog runs on Linode, because I think EBS is broken, but each to their own :)