If you're going to be trading the pink sheet stocks then I think Scottrade is the only one with a streamer that gives Bid and Ask on them. Free. I left them a while back to some small issues before I realized that pink sheet streaming quotes might be important. Then, too, they had a free streamer for everyone with such quotes but since they've stopped that so you need to have an account with them for that quote capability.
There are other brokers, as you say, like Ameritrade, that are okay but they don't have that one thing. I use Ameritrade and OptionsXpress. None of them are perfect.
I got shot off my horse. So what? I'm up again. Mark Knopfler