Integrated comparisons - Krell vs Naim vs Plinius vs Sim Audio

I'm looking for an integrated to mate well with a pair of Dynaudio Contour 1.8mk2's.  I listen mostly to classic rock, jam bands etc with lots of live recordings.  No classical, jazz or Diana Krall demo stuff that makes everything sound great.  I guess I need a forgiving, musical amp vs detailed and accurate. The following models have been suggested to me, so I did some research, and wanted to gather some additional opinions-  

Krell KAV-300i:  This integrated along with the subsequent versions seem to be great bargains in the used market.  I've never heard a Krell amp, though I'm confident it will have plenty of power for the 1.8's.  I'm concerned it might sound a bit thin and less engaging with music compared to the others. 

Naim XS-2:  I recently heard the newest Supernait with Dynaudio's, which sounded fantastic and had that lush, engaging quality that people seem to gravitate towards.  The Supernait is way out of my price range but I may be able to stretch for the XS.  I'm a little concerned the lower powered XS might leave me wanting for more, especially compared to the Krell or Plinius (both around 300 watts into 4ohms vs 100 for the Naim).   

Plinius 8200mk2:  I've never heard any Plinius gear either, but like the Krell the specs seem to be quite sufficient for loud music.  Some people have described the Plinius sound as sleepy while others say punchy and musical.  I guess its a matter of system matching, but I'd like to avoid sleepy.

Simaudio i5.3:  I used to own the Sim i5080 which I loved.  It was fast, punchy and smooth, but I wished it played a little louder because it really only opened up the dyn's at high levels, but at that point you could tell the little i5080 was running out of gas.  I've since wondered how my system would sound with one of their higher priced models.  The main concern, similar to the Naim XS, would be if the Sim's 130 watts would be enough to keep me looking for more (the i5080 actually had 140 watts, but I know the i5.3 is supposed to be beefier).   

Let me know if you have had experience with any of the above or similar integrated amps I should look at.  Thanks in advance.