There's nothing wrong with WP - it's light, cool and easy to use. I'd recommend you the services of Harvey who helped me with my site like 2 years ago, but he's around no more.
A time ago I was having the opportunity to work on same project with this guy:
Alt Agency | Web Design agency, Web Designer based in Birmingham, West Midlands - and he appears to know what WP is. Name is Craig Murphy - so try to get in touch with him.
There are more people in here who would do that job for you around - if you post it in the Hiring section, but I suppose it would be better to work with known people.
Cheers,
M.