Do you live on base? Is your husband AD or Activated Reservist? Do you live in a different zone than your husbands duty station? and by duty station, I mean where your husband is attached to his unit, not if he is in Iraq or deployed elsewhere.
If you are an AD dependent, living in the same area as your spouse's duty station, you would normally have TriCare Prime. You would use a MTF first, if they cannot accomodate you, you would use a doctor they refer you to.
Tricare Standard has co-pays and works as a kind of PCM type thing. You must, MUST, make sure they are a TriCare accepting physician, though, or it will be a fight to the death.
We are TriCare Prime. I hate it on this particular base, because their clinic bites, but every other base I have been on has had a full-service clinic, so it has always been good for us. If something here happens that they can't handle, they are great about letting us use Urgent care centers and the ER, as our clinic closes at 4, and TBH, they have been really helpful about some health issues I have had recently.
I prefer Prime.