Skip the package concept and pick individual appliances that meet your needs and budget. There are a bunch of recent threads on this very issue.

I'm with Weissman. Is there any particular reason you're wanting to go with a package deal? Also, many appliances are rebranded, so just because you're purchasing a Thermador DW, it's most likely a slightly modified Bosch. Also, if you are going with a pro-style gas range (or dual fuel) you'll want to make sure your microwave/hood blower will have enough cfm to exhaust.

That said, I would stay away from the Jenn Air. They're definitely not the same quality they were years ago. There's a thread on GW titled Kitchen Aid appliances or something like that (started Nov. '12 so it's fairly recent) where owners discuss how much they like their appliances. There's also plenty of negative feedback on other threads. I would search GW and Chowhound for information on the Thermador products. I think most people really love their gas ranges but (if I remember correctly) the refrigerator ice makers seem to have a lot of issues.