I have owned the NAD C340 and C350 and also the Arcam Delta 290 and preferred the Arcam. Contrary to Ryder's experience I found the Arcam to have more depth as well as a smoother, sweeter sound. The NADs were enjoyable as well (the C350 more so) but different. More punchy but somewhat grainy. Not as refined as the Arcam but more rockin'.
Hope this helps, unlike some of the other answers in this thread.
Hope this helps, unlike some of the other answers in this thread.