@maguiar102 - sorry, I have not examined every post in detail. I did go back and re-read your 5/5 post. It does become confusing because I don't know if you are intending the integrated to be part of a completely different system or if you want to wrap the integrated into your HT system using a "hybrid" approach (i.e. taking left/right output from processor and essentially using the integrated as a left/right channel amplifier). That being said, I do have the following comments:
Pass Labs Int250 - this is a FET based warm sounding amp, but with good resolution. It has a very pleasant and very controlled type of sound - the dynamics and slam are not as much as other amps. If you want a very pleasant listening experience with good resolution, this is potentially a good choice, but I would look elsewhere if you want a more exciting sound. I would put Pass Labs like a very neutral tube sound with excellent resolution and a definite FET based warmth signature.
Mark Levinson 585 - very smooth and liquidy, like I said. I would not say this is a "tube like" amp at all. It follows more of a high bias Class A bipolar amp sound. Smooth and liquidy. Again, it may be very hard to describe to someone unless they sit down with me and listen and then it's like "oh, that's what you mean by smooth and liquidy", lol.
Gryphon Diablo - The Gryphon room at RMAF was very nice. Based on what I remember, the Gryphon is not as clean/neutral sounding as your Krell S-1500, but it is still neutral (maybe just a very tiny bit of the Class A smoothness, but not bad at all). A very good contender. Definitely not liquidy sounding.
Hegel H590- I heard the H590 at RMAF. To be honest, it sounded very sterile and "solid state" with that harsh sterile edge (at least to my ears). I can't say that this is what Hegel normally sounds like, but that H590 could very well be a fresh-out-of-the-box amp and at that burn-in stage where it sounds harsh/bad. I don't have any experience with Hegel so I could not comment further.
Soulution 330 Int - I heard the Soulution amps at RMAF and this was one of those amps that I thought was very excellent. Of course, it is so out of my price range that I would not consider it, but it had the very clean and neutral sound. Think of a Krell S-1500 with a much more refined sound and no bright edge. The 330 Int looks to be $20,100 retail. Not sure if this is in your ballgame or not.