monroesilk, I don't think any of the yachts mentioned can be considered "trawlers." The engines may be able to reliably throttle back to 10 knots when you don't feel like going 20+ knots, but that's a completely different animal compared to throttling back to 7 or 8 kts when your top speed is 10 knots. The KK will do that.
You're considering a big and expensive purchase so it is assumed that you are an experienced boater. Have you clearly defined your requirements - irrespective of the layout/prettiness factors?