I have a hopper that holds 80, and i'm buying one that holds 110. I was going to buy a 140, but my coach said that the 140s are too bulky. Is that true? Also, i'm going to need a way to fill up these hoppers. The 80 one is about half full, so in total i'll need about 150 balls. I've looked on e_b_a_y for used ones since i'd be mostly serving with these, but i haven't been able to win an auction. What's the best place to buy them, and which balls do you recommend? I've looked at those grand prix balls, but they're upwards of 60 bucks a case!