High Quality Integrated to power Mani-2

Not sure if 1 ohm is accurate for the mani-2's but I'd take the 400xi off there. It's a really nice amp but it's not equippped to drive high power (mani-2 = 85db) into low impedences. See the measurments from Stereophile.

I've extensively auditioned a number of integrated amps, including those that you've mentioned, as well as the BAT and McIntosh for my Totem Forests. Although somewhat different specs from the Mani-2's the Forests also like power, but the don't have the low impedence issues. I ended up with the DK Design MkII, and have not regretted the decision. It also has a phono stage. You can pick up a MkII for a good price used, or go to the MkIII, which, I hear, has some minor improvements over the MkII (a change in some of the caps). The change in ownership also seems to be a positive for DK, but I had excellent dealings with Daniel in the past wrt minor warrenty issues. Worthwhile to audition in any case.

Look at GamuT.
My model 1's loved it.

Arcam Electronics are known to match well with the Totem speakers. You might want to try Edge Electronics G series.

sim is supposedly coming out with i7 andreomeda that sounds pretty interesting.