I agree.
Luckily for us, we weren't forced to confront the thin lines of our forces this spring. What if NK had decided to move south while we were fighting in Iraq? Well, it would have been scary, to say the least.
The chances of resolving some nightmare scenario like that one without nukes are dangerously low. Right now, we don't really have the conventional forces necessary to fight two major conflicts at once.
A buildup is expensive, but insurance is expensive too, and seems especially so when you don't need it. The whole point is to avoid the cost of a major war, and compared against that incalculable cost a military buildup is a small price to pay.
Not enough.
Not nearly enough.