We have used a number of hosts for Magento and a few that we can recommend are:
- ProperHost – SSD based hosting, good performance with heavy load 50k/m+ traffic
- SimpleHelix – Magento Hosting that has good performance, support, and value 40-50k/m traffic
- Siteground – Good value and Great customer service, good for light-medium load sites 10-30k/m traffic
We will grow this list as we experience other hosting providers that are suitable to recommend.