I never wax or top my Klasse twins (unless I had a dark car color). But I do QD quite a bit. I have used the following on my silver Honda - Eagle One W&S; Menzerna High Gloss Acrylic Shield; PoorBoys S&G and Jeff's Acrylic Gloss. All are very similar in application and ease of removal with the Eagle One requiring a tad more elbow grease to remove the haze. Each of these detailers have some strong points.
The appearance of all are very similar and they are all compatible with the Klasse. Perhaps my favorite is the Menzerna. It leaves a wetter look than the others and it is quite durable. I really think it could even serve as a replacement for the Klasse SG, although I use it only as a detailer. It is expensive however and not easily found.
If you have dust and even a little dirt, the PoorBoys S&G seems to attack it better with less rubbing. Having said this, I would rather use PoorBoys Spray and Wipe if the car has a little dirt on it and not use any of these detailers until I did that first.
Eagle One is cheap and found everywhere. It is by far the best value and bang for the buck of the QDs I have tried. Jeff's is very good too and leaves a shine about the equal, or nearly so, to the Menzerna.
Which is best is up to you to decide and there will be many opinions, and each is valid since color of vehicle and ease of application play major roles in finding the right QD for you. Just be sure you get poly and acrylic based products if you continue to use Klasse.