On Line Audio Mail Order Retailers

Not sure if could say these would be my top choice simply because they are the ONLY ones I have ever ordered anything from so far.
But I have purchased 3 separate items from Parts Connexion.
All 3 transactions were flawless, all arrived perfect and exactly as described and were a huge saving over new.

I have ordered from Music Direct, B & H and Best Buy.  All 3 gave great service.

Music Direct, Audio Advisor, Crutchfield, and for used audiophile items try TMR; The Music Room.
Check Amazon and you will see that they use third party vendors. Amazon does not stock high-end audio components. So if technical advice, returns or service is needed, vendors have different policies.