I had a system drawn out in my head like what you were saying.

Certain number of games played in order to qualify
Certain number of clan games to. (or should I only count clan games?)
For each game type I tally points according to that game type. Example: On slayer I tally and average kills per game. On CTF I count the flag steals and flag saves and stuff like that, same with all the other game types.

Also I think I will just do weekly Awards each saturday night and at the end of the month we make Player of the Month who wins a free random item.

Help me think of weekly award names because I have no problem going through the records and finding out who won each awards.

Some weekly ones I thought of:
Most kills
Most consecutive wins
Most dedicated (person who played in most clan matches)
Sniper of the week
Carjacker of the week
and soo on... help us make a list.