I wouldnt pair a Clarity with an HK... sure it will drive it, but it wont do it nearly as well as a good solid separate like Rotel, Parasound, or Anthem. If you do get the Clarity (or any ML), take into account the budget for a good separates set (around $1200).
With the HK335, the imaging wont be as solid (you will get a little fuzz around an abnormally larger image), the overall tonal balance wont be as good, and the bass wont hit as hard and as concentrated.