I have family unlimited (voice + messaging). For my previous phone, I had Total Internet for $20/mo. But, for the G1, they didn't offer me anything other than the basic two plans they advertized: $25/mo for unlimited data, hotspot, 400 messages, or $35/mo for unlimited data, hotspot, unlimited messaging.
I took the $25/mo, even though I don't need the 400 messages. It feels like I'm wasting $5/mo, but it's better than wasting $15/mo :-} and at $20/mo I was on EDGE, where at $25/mo I'm on 3G... so that's how I rationalize the $5 extra.