Thats a pretty bold claim that Rackspace is the only solid choice. There are many other providers out there that provide better white glove service.
The place I am at now has servers at Rackspace and we can't even get ticketing and other alerts to go through systems like PagerDuty from your own internal systems.
* 911 style issues answered in seconds over phone or chat * Integration with our ticketing system with PagerDuty / other tools.
Question: Cloud Monitoring is now free for all customers - AFAIK (we use it) CM integrates well with PagerDuty (which cough I use a lot). Are you looking for ticketing responses into the PD API, or all monitoring/etc?