Instead of using foundation have you thought of using a BB cream or tinted moisturizer? It doesn't give the same cakey affect as foundation but it still covers up and gives a glow :) (plus they're better for your skin) With BB creams you don't nessecerly need the most expensive ones Maybellene do a BB cream thats cheap it is great :) Also Garneir do a nice&cheap one too :) For powder, I personally find The Body Shop the place to go :) Their loose powders are great & don't break your purse (y) :) x

Love puremineral 4 in 1 powder.. When i put it on, it covered over uneven skin tone and looked really natural:)

I just got Tarte! It is amazing! It is basically all I put on and it is natural looking, not heavy, and covers wells! It is a bit pricy but it is great stuff!
http://tartecosmetics.com/tarte-item-Amazonian-clay-12-hour-full-coverage-foundation

the best best best best foundation is chanel perfection lumere...its a light cover and looks flawless and makes your skin look WOOOOOOOW