honestly, you don't need a bunch of expensive face washes! 

no matter what type of skin you have, this simple tea tree oil/castille soap combo gently cleanses.
ok, it won't remove gobs of waterproof mascara, but for everyday use it rocks!

i've been cleansing my skin with this particular product for years.
Here's a link to get it for yourself. 

UPDATE: i found the same product at a lesser price, so im updating my recommended vendor (7/22/2008) 

 

thoroughly clean face wash with castille and tea tree

 

$8 for 32 oz. 

Nice on the budget!