Rackspace - bar none - for anything mission critical in a dedicated setup. I've used Softlayer, HostMySite, and LiquidWeb before in an attempt to save a few buc

Rackspace - bar none - for anything mission critical in a dedicated setup. I've used Softlayer, HostMySite, and LiquidWeb before in an attempt to save a few bucks a month, but regretted it almost immediately. In multiple cases of downtime, the only response from Softlayer was "not really sure what happened." With Rackspace, I can sleep at night - and the extra $150 a month per server is well worth it to us. Peace of mind is invaluable, and expertise is irreplaceable. I also recommend Slicehost highly.