What is the best dry food for my 6 Week old Boxers?

Ive read that boxers usually require a special diet because of gastric problems such as becoming bloated and gy. I recently got 2 boxer puppies. Both 6 weeks old. I went ahead and purchased Chicken Soup for the Dog Lovers Soul at a specialty pet shop. I was wondering if anyone is familiar with this brand and whether it would be a good choice for a boxer puppy? Ive heard good things about it. I also read that Orijen and Innova are some of the best brands out there, but I dont have the money to be paying $65 for a 28lb bag. Especially with two dogs. All your advice and recommendations are greatly appreciated. Also, if anyone has any other "heads up" for me regarding boxers, please let me know. Thanks!