I've everything mentioned but the Arcams. It just so happens I'm a dealer for most all these, but the Arcams. I actually like most all these, but for different reasons. Of the four I rank as follows; Parasound, Sunfire, Sherbourn, Sherwood. Arcam even though I have not heard is very respected and would fall in 1-3 somewhere.
The Parasound is essentially the same as the Halo C2. It has modest looks, but sounds wonderful. It has a TEN YEAR warrantly enough said!!!
The Sunfire looks fantastic and sounds as good as it looks. It lacks the features as the Parasound.
The Sherbourn PT-7010A is a GREAT processor and is essentially the same as the Sunfire. The Sherbourns look much better than the website picture, too. I mean a lot better!!! Their matching amps are awesome.
The Sherwood/Newcastle sounds decent, but I do not think it's in a league as the above three. Plus, it's about 2x the size as the others making it tough to place in a rack.
Have no opinions on the Outlaws. The Emotiva's are fine units.