Hi Anne........ I think, from your original Q that you're having a complete entrance frame including sidelights etc.
Is that right?
I usually find that it is quite a bit cheaper to buy "off the shelf" and alter to fit.
Having the whole thing purpose made is usually the last resort, either because the opening is a strange size, or that you can't find one you like.
Iroko is an excellent choice.... also Idigbo. Plenty of joiners are using these as an alternative to oak. They're both about the same price, but cheaper than oak.
Have a look at a few here...........
http://www.eoburton.com/sawn-timber.html?p=1
3 or 5 bolt security is well worth it. It also has the advantage of holding the door in 3 separate places. This is often essential in stopping a door from warping. One lock in the middle can't do this. Doors inevitably bend away from the frame at top and bottom.
Solignum "Ensign Red", or "Sherwood Green"are classy colours. More subtle than paint finishes, which can be a bit gaudy.