A month has passed since I’ve moved to a Cloud Server from Rackspace and so far I’m pleased with the whole experience.
It did take a bit of tweaking before I got everything working the way I wanted. This mostly consisted of properly configuring PHP FastCGI as it’s a big resource eater. Another help was making sure that lighttpd is adding proper ETag’s and expire headers. On the WordPress side I was able to configure the WP-SuperCache which takes away some page generation overhead as well.
For the time being I’ll let Rackspace provide me a Cloud Server. I don’t generate that much traffic yet to convince myself to move to Linode, which has bigger VPS servers (more RAM, traffic and storage) for better prices.