Microdark in london are spot on. Click the name. I've linked it to their site.
Or
Bighellodesign. Another clicky one, mouse over it.
These are london type design houses though so proper money but you'll get a very good site from it that will work glitch free...
However, my friend is a student, she'd do it cheaper, she can put some decent together although it probably wouldn't be as complicated...
Above all that though a huge number of people are now turning to word press, you can do it all yourself, and therefore you can keep it updated yourself, it's super basic, you don't need any software, it's all on the net so you just use your domain and upload as you would to hear or photobucket.
Google it, have a look. If you need Sam's details give me a shout mate.