Not saying the Fila is better than what you have, but it is certainly a great pairing with the Merlin, between ergonomics and money in your pocket, I don't you will be dissapointed. I made the move from CAT amp and pre to the Ars, and in terms of musical satisfaction I thought the Ars was right up there. If you want to improve on what you have and the Ars, I think you would need to make a move to OTL amps (Joule or Atma-sphere), but for many, they could just live with the Ars and not think twice about it. I do prefere the Atma-sphere separates, but you are talking 3x $$$, alot more tubes and heat, and space.