I'm on the same issue as you. Check this out - I got a 32gb iPhone 4 from a guy in the US, a friend of mine, as he couldn't use AT&T in the area he lives in. More money than brains, so he sells it to me for $200.
I'm in Canada so I want to unlock it, but I'm stuck on the same baseband as you guys. Waiting for that ultrasn0w update!!!
But I so appreciate the free work that the dev team do, so I'm not complaining or impatient. I can't believe they put so much time into it.
Jailbroken phones are so cool though.