I'm a former Beethoven owner, I moved up to the Strauss. I preferred a SS amp. I know some like a tube amp with the Beethovens, but IMHO the bass was not tight enough. I used a Classe CA-200 with great success, until moving up to my current Threshold T400. If you want to stay with an integrated, I'd recommend the BAT VK-300.
Good luck,
John
Good luck,
John