If you don't have a trade, you are right with waiting for a "left-over" coach for the deal. But what is a deal? You buy, in this case, a Entegra Coach Anthem 2013 now for big discounts 35% off MSRP. First you have to find a dealer willing to do this. But lets use an example. You now are the owner of a 1 year old coach.
Used 2013 Anthem's are on the Inter-Net for as low as $275k. Did you get a good deal?

Entegra allows full transfer of the factory warranties.
And since you have a coach now, doesn't the value of yours lower as well? I know the guide books come out 4-times a year. I'm pretty sure your coach does not go up in value.
The gap will always get further apart with a trade and time.
To work you BEST deal, sell your coach first, then work out the best numbers off the MSRP price.
Good luck.