I would highly recommend iXWebhosting. I host one of my sites there. My next 2 sites are under development and will also be hosted there. The plans they offer are very scaleable and will suit any business from a single page ad to a full-blown e-commerce enterprise.
Besides the most powerful cost effective packages on the net today, perhaps the best of all with this company is their willing manner when answering support requests. You actually get to speak to humans and don't have to put up with constant exchanges via email which is very annoying.
Check out their packages here
http://ixwebhosing.active.ws/
And yes - I am an affiliate, but I hosted my site with them before becoming an affiliate. I just want to spread the good word about them. They excel in service provision.
philipio.