Even Boalt won't necessarily give you great chances of teaching, especially w/o a clerkship. Clerkship depends on 2L grades at Boalt. I know they have no grades per se, but students with a transcript full of honors are probably more likely to clerk. Also, I've heard that they will release rankings in confidence to judges for clerkship purposes only but I don't know if that's true. Even if teaching is out and clerking is out, Boalt will give good long term prospects even though you might not get biglaw b/c of the economy.
As far as the kids issue, I suppose a lot depends on your age and when you plan to have kids. Also, if you're planning to take advantage of Boalt's LRAP (either as a first plan or backup if biglaw doesn't work out), read the fine print. Many school funded LRAPs take ALL of your assets into account including spousal income.
I can't see Hastings really being worth it. It might marginally increase your chances of clerking but will do absolutely nothing on the teaching front.
I am faced with a very similar dilemma right now - think I want to have a federal clerkship and teach eventually. Currently full scholarship at a T3, top 2%, law review, very good regional reputation (southeast).
I've been accepted to Hastings and waiting on Boalt or Stanford (which is a long shot). I don't know if I want to be East Coast or west (although family is east coast) and I will be about $150k in debt if I transfer.
Is it worth it to go to Hastings?
What about Boalt (assuming I get accepted). What about the unmentionable fact that I am a woman and may want a family at some point?