Comfortable key input controls for fighting game on a KB.

What are some comfortable key input controls for fighting games on a keyboard?

Okay, I downloaded CPS3 and I'm playing Street Fighter: Third Strike.

My controls are like this:

U, I, O. = Light, Medium, Heavy Punches.
J, K, L. = Light, Medium, Heave Kicks.

I seem to be doing good at it but not quite as comfortable as MadCatz Arcade Stick.
I can't execute it fast since it's quite confusing.

Things happens like this: "Alright. I did a medium kick, time to link it into a special art. SHIT I PRESSED THE WRONG BUTTON. WTF!! This is some confusing shit!"

So I need some comfortable key input controls. Help shall be appreciated.

Maybe on topic, but do you have a PS3 or wired 360 controller?

If you're using a keyboard, don't ask us. Try out different key combinations to see what suits you.