I do want to model Dungeons & Dragons (and fantasy heavily-influenced by D&D) but I agree with your list of classes. Warrior, Scoundrel, Scout, Noble, Mage, and Priest.drothgery said:Cleric (Champion, Priest, Healer, Ascetic trees)
Fighter (Knight, Martial Artist, Weapon Master, Beserker trees)
Noble (Influence, Inspiration, Lineage trees)
Rogue (Fortune, Misfortune, Thief, Dungeoneer trees)
Scout (Awareness, Naturalist, Hunter trees)
Wizard (Sage, Warmage, Beguiler, Necromancer trees)

All classes (under Saga) share the Talent and Bonus Feat features. Individual choices within those allow each class to cover a wide array of class concepts (and Trained Class Skills as well).
However, some parts of semi-generic Saga classes are the same for every member of a class.
1. Base Attack Bonus
All warriors have a Fighter base attack bonus whether they're an armored tank or a hard hitting brute. Should we have any class with Wizard base attack bonus progression? I personally want at least two classes to have Fighter base attack bonus progression. Perhaps base attack bonus is less important in this system but until I believe that I would want players desiring Fighter BAB to have more than one option. I suggest Fighter base attack for Warriors and Scouts; Cleric base attack for Priests, Scoundrels, and Nobles; and Wizard base attack for Mages and Psionicists

2. Defense
There are three (3) defenses and six classes so approximately two (2) classes should be "good" at each defense. Probably Priests should have Monk-like equal bonuses in all three.
3. Skill Slots
I'd like to see a little more flexibility here than D&D because I like that Saga Warriors don't get only two (2) skills.
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What I'm nervous about is how one would make a Paladin. One option (that I favor) is to have a set of low level Priest, Mage, and Psionicist powers available to everyone (like Force Adepts in Saga) and a Paladin is just a Warrior with the Priestly talents. Two alternate options would be a Priest-light talent only in the Warrior talent options or a Fighter/Magic-User class (a seventh character class) that has talent trees for Paladin, Ranger, Hexblade, &c.