Also a NW20 here, my fave blush is Cute, Sweet William is nice as well (altho Unfortunately it was LE) but if you can get your hands on that then thats nice. And for a peachy look, well Peaches is great for that.
I use Golden Bronzer, but it may be just a touch too dark...
Also some other cheek recomendations other than blush I think are awesome are:
Glissade MSF
Delicacy Iridescent powder (as a highlight for the cheeks)
Ice Iridescent powder
Some other Non-Mac blushes I like:
Clinique Iced Lotus Powder blush
Bobbi Brown shimmerbricks in Pink, Rose and Apricot with a very light hand.