What's the right "Avon-Mark" powder buff foundation color for me? - color mark

In considering the revision of the Mac is my color NW25 and I do not know what is comparable to the brand Pula Powders Natural Skin Foundation. Help!


Here is the link for color mark Powder Buff:
http://shop.avon.com/shop/product.aspx?src_page=product_list.aspx&level1_id=300&level2_id=469&pdept_id=483&dept_id=490&pf_id=30488