I'm surprised Internap hasn't been mentioned, they're quite large, have a great network and support. Other worthy mentions include Rackspace, SoftLayer, Leasew

I'm surprised Internap hasn't been mentioned, they're quite large, have a great network and support. Other worthy mentions include Rackspace, SoftLayer, Leaseweb, Peer1 and SecuredServers (aka PhoenixNAP) all of which are large companies by hosting provider standards. Also, in Canada there are iWeb and Netelligent who have great networks. Based on personal experience with all of the above, Internap, Rackspace and Netelligent have given us the best value and overall experience.