Agree w/ Texas as those are some good choices. Personally i feel, and idk some may disagree but neways, that other than anabolics no supplement will really give you much added mass. I feel they can help maximize the amount you can get during a given time, and help keep fat down but not directly aid in a huge amount of added mass.
W/ that said you should have plenty of success with the AP and P-slin. Possibly look into homemade gainers, intrabolic, beta alanine, or x-factor. Choose maybe one thing to add and you should do great.. Good luck man.