Wow, that is alot of problems. I have an 03 Sedona EX that I bought in Feb 03. I have it now over 3 years and it has 56,600 miles. This far I have had both horns replaced, they stopped working. A new (remanufactured) alternator installed 2 weeks ago. The door handles get stuck in the out position when opening the doors in really cold weather, they must use a thick lube that hthickens in the cold. Other than the alternator the problems have been few and minor. I like the van and would recommend it to others.
Good Luck with yours,
Brian