mac is definitely the way to go there eye shadows are high pigmented they might seem a bit pricey but they last a long long time. I still have eyeshadow from two years ago that still work perfectly and I use them almost everyday, and they stay on pretty well even without a shadow base. they have a huge selection and make up artists there can answer any questions you have about eye color eye shape or how to use them. highly recommend them! mac also has pigments, shades sticks, paint pots and other stuff that might work better for you. its worth looking at
I normally wear eyeshadow from MAC, but I also like Almay. Almay has an eyeshadow palette with colors that compliment each eye color, so I would go with that, if you are looking for something to bring out your eyes more. Go for colors such as peach, gold, brown, grey, or plum.
You can also find out more things by reading this, probably: link