Science Diet is not one of my personal favorites, and I would definitely choose Nutro over it.

All three of mine love the Kong, although Aneko is usually the first one to poop out and give up. Millie is totally food motivated, so she'll go at it for hours.

There are a lot of good foods, just buy the very best that you personally can afford.

Some good ones are

Wellness
Innova
Natural Balance
Nutro
Nature's Recipe
Chicken Soup for Dog Lover's Soul (very popular, good ingreds)
Canadae
Flint River Ranch
California Natural
Royal Canin
Go Natural