Both of these companies have a fantastic range of veneer's and should be able to provide all you need. I have used both in the past and they have provided great results.
Also have a search on these very forums for veneer as this topic was covered a few months back.
As mentioned before SPA Laminates are, in my experience, the best people to deal with. No matter how small the order they really do break their backs to get you what you need and something that you are happy.
Not as cheap as some but the quality of their veneers is very good and if you don't fancy applying and jointing the veneer yourself, you can get them to make finished panels for you out of pretty much any wood/board.