Both the MARTIN and the CONN are top of the line pro saxophones. The CONN 6M lady face is the real deal!!
If I had a choice, I'd take the Conn 6M over the other 2 saxophones, but the MARTIN Committee also called "THE Martin ALTO" is also a great sax.
The bottom line, it's not the horn it's the player, maybe what you really need is a YAMAHA YAS 23 with a classical Vandoren mouthpiece. When you can master all 4 volume's of the blue RUBANK book ,and then master all the standard repertory saxophone literature,such as...
18 Exercices Ou Etudes d'apres - Berbiguier / Mule, $29.40
24 Intermezzi - Rascher, $19.50
48 Etudes d'apres - Ferling / Mule, $29.40
Advanced Jazz Conception - Niehaus, $19.95
Art Of Saxophone Playing - Teal, $17.95
Basic Jazz Conception For Sax, Volume 1 - Niehaus, $19.95
Basic Jazz Conception For Sax, Volume 2 - Niehaus, $19.95
Charlie Parker Omnibook (E-Flat), $16.99
Fifty-Three Melodious Etudes, Book 1 (B220) - Rossari/Iasilli, $10.95
First Book Of Practical Studies For Saxophone - Hovey, $7.95
Five Minute Theory Book 1 - Wessels, $3.95
Forty-Eight Famous Studies (B103) - Ferling, $8.95
Forty-Eight Famous Studies, 2nd Part (B104) - Ferling, $8.50
Foundation Studies (B496) - Baermann/Hite, $12.95
High Tones - Rousseau, $29.95
Intermediate Jazz Conception - Niehaus, $19.95
Larry Teal Daily Studies Book (1905-1984 For The Improvement Of The Sax Technique), $19.95
Melodious and Progressive Studies, Book 1 (B379) Gr. 2, Hite, $13.50
Melodious and Progressive Studies, Book 2 (B472) Gr. 3, Hite, $13.95
Pares Scales For Saxophone - Pares / Whistler, $6.50
Rubank Advanced Method, Volume 1 - Voxman / Gower, $6.95
Rubank Advanced Methods, Volume 2 - Voxman / Gower, $6.95
Rubank Elementary Method - Hovey, $5.95
Rubank Intermediate Method - Skornicka, $5.95
Saxophone Altissimo- High Note Development For The Contemporary Player - Luckey, $19.95
The Saxophonist Workbook - Teal, $14.00
Scales For The Saxophone - Rascher, $8.00
Second Book Of Practical Studies For Saxophone - Hovey, $7.95
Selected Studies For Saxophone - Voxman,H, $6.95
Then you can upgrade to a pro saxophone like a Selmer Mark VI, Yahama 62, Yahama Custom, or a Selmer Super Action 80 series II.
Remember, It takes your entire life to learn the saxophone.
Then when your done with all the fundimentals...
then you can start to think about learning Jazz Improvisation.