Selecting the wrong host can be costly for your business, if your host's web server is down, then your emails will stop arriving.
There are many web based companies out there who will offer web hosting at rates which are simply not viable, they provide services which are not dependable, and then, you have an impossible task in trying to contact them, you could be without web and email for days.
Screen Spin have provided virtually 100% uptime over the last five years. We had one interruption when a hard disc had to be replaced in one of our server in August 07. The failure of a disc cannot be foreseen, but as all our servers are mirrored to another disc there was no loss of data, sites, email or down time other than a pre-arranged midnight replacement.