Headphone amps


I like to listen to music at night - my wife likes to sleep - I can't understand why she does this with so much good music to hear. Headphones have been a blessing for maintaining peace given our somewhat different nocturnal patterns. I'm soon getting a new integrated amp without a headphone jack, so I will require a little amp for the headphones. Please provide recommendations for headphone amps that you have used and loved. I like to listen to jazz and classical at night. I'm using a FMJ 23 as a source and I tend to like tube sound. I have Sennheiser HD 600 headphones.
johnrob
I don't know about the matchup of my amp with the Seinheisser 600's, but my Berning Micro-ZOTL with Sony MDR-CD3000 cans is magic.

Definitely check out HeadFi for all your headphone questions.

Marco
I would definitely upgrade to Senn 650s--I did on the advice of some Headfi posts & found them to be a major improvement: a fuller but not overwhelming or forward sound. The 600s sounded thin to me. I use the newest version of the Headroom Max (with the new "reference module")with the Zu Mobius cable & I am very satisfied. Tubes are nice but you have to plan your listening because you really can't leave them on all the time, I think, & they need to warm up. Make sure you get good interconnects from your source.
I would have really liked a set up like Marco's and did look long and hard at the Micro zOTL. But I was doing this just so I could watch DirecTivo late at night without disturbing anyone. Functionality, price and nice looks were my main criteria so I opted for a Channel Islands Audio VHP-1 with Koss KSC-50 ear/headphones. For quiet TV listening I like this combo a lot.
The microZotl works just fine with the Senns (my second HP rig), but may be a little laid back for some. The 650 is better. Hard to find the micro used, but they do turn up on Head-fi occassionally. Cheaper than the RKV for sure.