I used to own the Lyr 3 and didn't think it synergized with the HD 800. Wasn't bad but nothing special. If you're OK with a laid back presentation, the Drop CTH synergizes quite well. In that case I would recommend using the Amperex 7308, brings out some additional details with the HD 800. If you can find the Drop EC Jr, amazing tone with the HD 800 for the price and use the often recommended GE tubes. Haven't tried the other two you listed.