1 server, shared hosting, Apache + mod_wsgi + web.py, MySQL. 160mb of RAM. Not sure about the other system specs on that host. It held up because I used a CDN for all the assets and because I generated static pages. I did have to monitor it though and increase the RAM at one point.
What CDN did you use? CloudFlare?
Amazon S3 (which ended up costing me more than my hosting, by the way).