Just to let you know that I exchanged my Nad t773 for the Arcam 250 and by my standard (my hearing capabilities) I can honestly say that I believe that for me it was an upgrade, music and movies are much more detailled and effortless, also the bi-amping is truly wonderfull. If i had to do it all over again... I'd by the 250 right away, I might of bought the 300 but it's a little too much money for me.
To answer your question; run don't walk to the store and buy the Arcam.