I'm currently luving my Eppelsheim soprillo and bass sax to low A. So I might be biased but here is some information on what some people consider to be the best modern saxes in the world today.
Website: eppelsheim.com - Note sound clips
Wikipedia: http://en.wikipedia.org/wiki/Benedikt_Eppelsheim
My experience: Benedikt is a genus who oh-by-the-way happens to be a true gentleman. Both of my purchases went flawlessly. Communication with Benedikt during the design period for the bass sax to low A was easy and painless. People who play these instruments are amazed at the great intonation and easiness when voicing the notes. For example, the bass sax needs no alternate fingerings to play the full range of the instrument. And there is a sweet altissimo key below the right thumb for playing above the range.
Website: eppelsheim.com - Note sound clips
Wikipedia: http://en.wikipedia.org/wiki/Benedikt_Eppelsheim
My experience: Benedikt is a genus who oh-by-the-way happens to be a true gentleman. Both of my purchases went flawlessly. Communication with Benedikt during the design period for the bass sax to low A was easy and painless. People who play these instruments are amazed at the great intonation and easiness when voicing the notes. For example, the bass sax needs no alternate fingerings to play the full range of the instrument. And there is a sweet altissimo key below the right thumb for playing above the range.