[Froofy-D]

The stats systems that are the most elegant imho are the Fallout : SPECIAL system and the Shadowrun system. Both have:

Base Stats: Str, Dex, Con, Int, etc...
Derived Stats : calculated by combinations of base stats

So, just as an example, if you had base stats of STR, CON, AGIL, INT, WIS you could have derived stats something like:

Melee Hit: derived from STR + AGIL + INT. Because: STR = armor penetration, AGI = quicker strikes, PE = ability to anticipate opponent.

Melee Power: STR + AGIL. STR = raw power, AGIL = precision strike.

Ranged Hit: based on AGIL + INT. AGIL = precision and quickness, INT = ability to anticipate opponent.

Armor Class CON + AGIL + INT. CON = shrug off damage, AGIL = dodge, INT = anticpate opponents move

A derived stat system makes it so that more stats matter to each class, thus there is a bit more depth to character creation and gear selection.

You can also make more stats matter by giving resist bonuses for different stats:

Snare/Slow Resist: STR and AGIL
Charm/Illusion/Sleep/Mez/etc...: WIS + INT
Poison: CON
etc....