Really nice to hear from an American man who sometimes travels to France! I know Velizy from its shopping centre - I sometimes hang around this place.
As for high-end audio shops in Paris, the most important one is probably Présence Audio Conseil (www.presence-audio.com/) -this is where I bought my SR 009 - SRM007 tII combo! They very easily lend top level cables without demanding a deposit. If you want to test specific configurations, call them before and they set up the elements you want to hear.
We also have two very good magazines, Stéreo Prestige and Haute Fidélité.
I live in Pontoise, 40 km NW of Paris, where I work -in a small IT company located in one of the Bon Marché department store buildings. Should you be in Paris, please contact me so that we have lunch together and talk about HIFI -or anything else, I'm continually trying to improve my English. Here is a personnal mail address: email@example.com. If you prefer, we can communicate in French.
PS: regarding your logo, I consider Futurama is far better than the Simpsons (same authors and production)
I will definitely try to give you a call the next time I travel your way (my company has a travel freeze currently, so I don't expect it to be this year). I would very much enjoy getting together for a meal and discussion (in either language, though I'm sure your English is better than my French..............I'm much better reading than I am talking or comprehending the spoken word, which I need to remedy some day).
What do you have for a DAC in your system? I have a Wadia 27ix which is a bit old, and the DAC is probably the next thing to go after now that I've settled into headphone monogamy (009+ BHSD, c'est le fin pour moi).
Have you heard the TotalDAC by Vincent Brient? I have heard very nice things about it.
p.s. I agree completely regarding Futurama!