A very good foundation primer to disguise enlarged pores is NARS Skin Smoothing Face Prep which is designed to minimize the appearance of fine lines and pores with just one application. You can find it at: http://sephora.com/browse/product.jhtml?id=P261210
To help reduce the size of your pores (and not just disguise them) I would recommend Perricone MD Intensive Pore Minimizer which is designed to address enlarged pores caused by active oil glands, dirt, wax, or chronological aging. You can find it at: http://sephora.com/browse/product.jhtml?id=P259938
I hope this helps you.