Mac foundation ?help :(?

Hey guys:)I'm looking for some help with mac foundation..I'm 17 with relatively ok skin..I have a good few spots and open pores on my cheeks and nose..I have normal combo slightly oily skin also..I have studio finish concealer for my blemishes so I don't need a heavy full coverage foundation so really I'm looking for a light natural flawless coverage..possibly a powder to apply with concealer on good days or over my foundation or tinted moisturiser when I need..what would mac frequent users recommend ?mabye mineralize skin finish natural ?or select foundation ?I'd prefer a powder but if there's a good liquid I'd definitely consider it..thanks :)