Oh, Eric, I went back and looked at the rules for D20 Modern. It does not use fatigue points. It uses standard D&D HP rules instead. They do not use Prestige Classes. Instead, they have base class (strong guy, charismatic hero, etc) that focus on abilities intrinsic to the key attribute. These give you your class skills, base HP, etc. and can go up to level 10. You also pick a starting profession, which grants you some other class skills and modifies one's starting Wealth score. Later, one moves into an Advanced Class, that has certain prerequisites and is more fine-tuned or specific. These also have 10 levels. (The profession has no levels and just changes one's wealth, adds a few class skills, and in some cases grants a feat.) It says that many of the standard folks in the world never attain an Advanced Class.
A fighter pilot might have the Dex-based base class (Fast Hero), the pilot profession, but may never be "good enough" to rise into the Ace Pilot advanced class, for example.
The basic classes have Talent Trees that one can use to gain abilities. The game also has Action Points, that works somewhat like Karma in Marvel, to change dice outcomes. Like the D&D monk, everyone gets a Defensive bonus that's level-based. This way, everyone isn't reliant on armor to stay alive in a fight.
I think the abstract wealth system of D20 Modern would be a perfect model for Dark Reign, too. Your starting class and profession give you a wealth score. You can then buy equipment by comparing the item's cost to your score. But it's a score, not a pile of coins like D&D, so there's no accounting involved.
http://www.12tomidnight.com/d20modernsrd/Home.php