You're also just about forced to use RHEL if you're a customer of Rackspace's managed hosting. My life would have been quite a bit simpler on Ubuntu with Postr

You're also just about forced to use RHEL if you're a customer of Rackspace's managed hosting. My life would have been quite a bit simpler on Ubuntu with Postrgres - RHEL and MySQL have led to at least one problem each - but Rackspace only supports MySQL on RHEL. Or at least, that was the case 15 months ago when I signed up with them.