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
A few suggestions:
1) Perreaux
2) Antique Sound lab DT/OTL headphone
3) Musical Fidelity X-Can v3
4) Headroom amp at your budget level

BTW, do you need a tape loop in the headphone amp or are you planning using the integrated for a pre-out?

For even more info:
Check out Head-fi.org. The greatest source on all things headphone.

The second place to go is headphone.com. Headroom's own web site.
Here's what I've been using with my Sennheiser HD-600/Cardas cable, for the same reason too(wife and kiddies sleeping). It can also double as a preamp in a pinch.

WooAudio 3

Nice little OTL tube headphone amp/preamp. BTW, I have swapped in Mullard tubes, and it's realy sweet sounding now.

Cheers,
John
John- I'm thinking about buying the Woo as well...did you compare it to others?

How's their customer service?

Thanks!
Another good choice is an Audiovalve RKV Mk2. Its got some punch which is nice with the Senns. Has a loop out. OTL/tube design, tubes are inexpensive and amp auto-biases.