[helter skelter]

I don't have much experience in cash NL, since I have mostly played tourneys, but it seems there's a tradeoff. I think a medium or big stack is good to have in case you get in a pot with a well financed donk. On the other hand, you have to play more cautiously against good players, so you might end up giving them good odds on draws because you dont' want make large bets with a hand that might not be best.

As to your comment on getting more action with the set, I had that situation last night. I might have had my turn reraise called if my stack had been shorter, but when I think about it, I wonder if that situation comes up often enough that it should influence the buy-in.