I use Namecheap and GoDaddy... I much prefer namecheap due to their cleaner site design and interface.. GoDaddy is upselling like crazy and it only seems to get worse. I just dislike how 'salesy' the checkout process is, they're very aggressive. Good service though, and prompt at helping with issues.


Hosting-wise, I've had everything from $5 hosting to $5,000+ hosting at Rackspace (2 servers, load balancer, firewall, and dedicated proprietary DDOS protection). One of the absolute kick-ass companies in the hosting world right now is MediaTemple. These guys are extremely affordable, can scale with your business almost infinitely if needed, and are TOP NOTCH at service and support. They're really good, and I doubt you'll find many who disagree. Rackspace is another great one with fanatical service, and they host some very large companies (think they even went public not too long ago).

Just my .02

(EDIT) You can also check the advertiser column on the right-side of the TechCrunch home page. These guys are the trusted news source for start up businesses, and as such, attract a lot of great hosting companies as advertisers. I've seen Media Temple and Rackspace both advertising there for quite some time, along with handful of others.