Amadeus is one of Dormeuil's entry level fabrics, but that does not make it cheap or low quality by any means. It's also Dormeuil's best selling fabric because it is great for regular wear and has a nice hand. It's an excellent selection and I think you'll be very happy with the suit.
I think Dormeuil and Scabal both have some great strong points and have a slightly different focus. I personally like these two Huddersfield makers as some of the best fabrics at their price points from my experience, but that is mostly a preference.