Interesting posts...

I have been investigating Dutch bikes for the past 2 months. I think the key is you can't be in too much of a hurry, I commute 20 miles/day RT at 12 to 15 mph. Some key features that I really like are:
- Internal Gear Hub for lower maintenance
- Completed enclosed chaincase - same reason
- Internal roller brakes - same reason
- Upright riding position - very comfortable, no sore back

I could not justify the $1500 at this time, so I "converted" my Schwinn Searcher NX8 to a Dutch bike for about $150. It has worked great for me. I am getting a Hebie Chainglider to enclose the chain. Another key is to have excellent tires (Schwalbe Marathon Plus for me) to eliminate flat potential.

Good luck!