I've been very happy with http://www.hardhathosting.com, particularly with the /sites approach that Drupal now uses for hosting multiple sites on a single installation. HardHatHosting has good performance, a decent control panel, reasonable and flexible pricing and solid technical support. Not affiliated in any way - just a happy customer.
I am having problems with my hosting company and am looking at others to consider.
I am trying to find one that is cheap and which offers reseller capability and/or can