The Innova starter set has a nice trio. Aviar, Shark, Leopard. There is nothing wrong w/150 class either, I wouldn't worry about starting kids odd w/max weight discs. More understable, something like a Stingray or Kite could do well. The Skeeter is also a good straight disc.
Personally I'm a big fan of both the Shark and Leopard. My Stingray I just picked up recently and it's nice, but I want more practice w/it.
Other companies are good too, but I would check out that EDGE link that got posted. Discraft's Magnet and Buzzz would be a great putter/mid combo. Honestly you probably don't need anything bigger than a mid for the kids starting out. Fairway absolute max.