With the six basic classes of d20 Modern its entirely feasable to have just those classes alone, have a bunch of talent trees to represent things like psionic powers, magic powers, martial maneuvers, rogue abilities, inner powers (monkish and rage type stuff), things like that...and not all of them have to be class specific.
Just have the talent trees and feats seperate...so perhaps a martial arts talent tree could be picked up by any of the Strong, Fast and Touch base classes, psionic powers by Charismatic, Dedicated, and Intellectual one (can't remember that name), and so on...having a bunch of advanced and prestige classes just adds to the metagaming and, therefore, ruins the feel of the game for me.
If they did this it would be the best class type system invented, the most versatile, allows for free building of characters over time (no more thinking, I gotta have these three feats, have my bab up to this much, and i have to have a skill or two equal to a certain rank). You could have some talent trees only available of people pick earlier talents (like they already do in d20 Modern), or have a limitation like...a person can only gain access to a magic talent tree if they already have the initial Feat in the d20 Modern game, otherwise they can't gain access to that tree.
Just have the talent trees and feats seperate...so perhaps a martial arts talent tree could be picked up by any of the Strong, Fast and Touch base classes, psionic powers by Charismatic, Dedicated, and Intellectual one (can't remember that name), and so on...having a bunch of advanced and prestige classes just adds to the metagaming and, therefore, ruins the feel of the game for me.
If they did this it would be the best class type system invented, the most versatile, allows for free building of characters over time (no more thinking, I gotta have these three feats, have my bab up to this much, and i have to have a skill or two equal to a certain rank). You could have some talent trees only available of people pick earlier talents (like they already do in d20 Modern), or have a limitation like...a person can only gain access to a magic talent tree if they already have the initial Feat in the d20 Modern game, otherwise they can't gain access to that tree.