I was very happy with the reliability of my dual Xeon boxes at ThePlanet. I only left ThePlanet to get my own cabinet and servers. RAID would be an extra cost, dual power supplies are kind of a waste there unless you control the cabinet that the server is housed in. I don't know if they still offer them, but my dual Xeons were in a blade server which should have redundant power supplies already. They also have remote backup via NAS / FTP included.
Matt Bloom AngryHosting - Load balanced/redundant shared hosting solutions