Sony used to offer "Refurbished" units at their outlet stores. Refurbished, it was explained to me, meant that it didn't pass the original quality control criteria and was removed from the assembly line. Those units were then gone through by technicians, the issues resolved, and the unit sold as a "Refurbished" unit, being clearly marked on the outside of the box. So, is your Arcam unit at Amazon a good deal? It's hard to say, but if the dealer offers a warranty, what have you got to lose.
P.S. I second the choice of an Oppo! I have an Oppo 105D, and it was a good deal, even at full retail price.