I’m sure the dealer is as frustrated as you are about your harp being delayed. Are you sure the problem is at the dealer level? There may be delays at the factory level that are beyond anyone’s control. I remember having to wait beyond the estimated time of arrival for my harp, but it was worth the wait.
The best way to determine the harp for you is to play the different ones out there. Find the one that you and your body likes the best. Also, have someone else play them for you too so that you can compare their sound from further away.