AUG and P90 do make excellent bull pup guns for beginner. if it is up to me, I would try to find person who has those guns and see for myself. Xtreme tactics has lot of guns on display (in locked room with 2 huge window). I know that Store don't have AUG on display but I remember that they has P90 on display.
my english is bad. however, It don't make up different on your ignorance.