I use Hostgator for most of my projects. They are just awesome! No downtimes, no warning emails! And best of all, their customer relations is top notch.
I also use Aquariusstorage.com for some of my other projects, which are still in beta. They are quite cheap and also uptime has been great for the last 2 months I have been with them.
I will also be starting a Web hosting company from the Hostgator reseller I got, so maybe I can also mention my company when it is launched