If you get him neutered, which is highly advisable, it might be best to get him a female. You could actually get either, but if you get another male, then you would need to do another neuter.
I dont know what kind of pellets you are feeding, but its always best to give them fresh foods. Most people here give 50% protein, 25% vegetables and 25% fruit everyday. Giving the pellets as a treat would be good for their dental health.
If you want to know more about diet, feel free to post any questions you may have. Just a warning, diet is the most controversial subject and you can speak to 10 different owners and get 10 different answers.