In reply to hms:
Sounds as if you're looking for someone who can do the following:
- design
- specify
- supervise & organise
None of the occupations you list would do all 3 properly. So you either need to compromise on what you want them to do or employ more than one such person.
If you want 'design' as in architectural design, then you're best going with an architect and then a project manager. The former won't do supervision on site. Or if they do, you'll pay an additional fee for it, and you'd be better off getting someone cheaper to do that side of things. If you just want a few bog standard things done, regular replacements/upgrades etc, then a surveyor could do the specifying and supervision. A PM will do specifying and supervision, but won't be great on the design front.
Just going to a builder will, in my opinion, limit your options as they tell you only the stuff they can do so they can keep your money all in their remit. They also are more prone to let things slip slightly, as they know making a 100% perfect job will eat into their profit.
To summarise: jack of all trades = master of none.
Good luck.