I help a lot of my friends and family develop small websites for their business or blogging needs. Rovity has now become my host of choice. While Support isn't live they go above and beyond in trying to help out no matter what the issue.
The price is incredible value and I highly recommend them.
I don't yet have experience of a having a site that has hundreds of thousands of visitors a month yet with them but given my experience I'm sure they will either have a solution for me or point me in the right direction.