good headphone amp/preamp?


OK, looking to get a headphone amp for Senn HD 600s that might also do duty as a preamp running with my ATI 1502 or Mcintosh 250 and Ohm Walsh 2s given some space issues? I saw writeups on a couple of ideas in Stereophile...Little Dot, Music Hall...Chinese tubes for small $. Also, have seen things on the 'gon, like Canary. Looking for something under $500...$300 might be better. Any input is appreciated as I will be bying off the net as I wont find it out here in HI. If it is only good as a headhpone amp thats ok too as thats my primary need. I listen to lots of jazz, acoustic, female vocals,guitar and piano, 70s singer songwriters.
joekapahulu
Thanks for all the input. Got some things to chew on here...and I need to get it right and think about how it will get the most use. Have bought too much stuff in the last year searching for improvements and its sucking up space and money.This issue of listening with phones only recently came up due to new neighbors so it has thrown me off course.
Don't you just love new neighbors?
Its hit or miss when you live in an apartment like me. There are some room treatments you can do that might tame the noise unless its late night listening you're alluding to.
Good luck, and mind your ears with those headphones.
Haven't heard it, but what about the new Musical Fidelity M1HPA? (http://www.musicalfidelity.com/products/M1-Series/M1HPA/M1HPA.asp)