With bandwidth costs the way they are today, I'm sure you can do better than a T1. If you get bandwidth from the same Tier 1 provider, you generally can pass traffic across their backbone at full speed.
I'd talk to Cogent or Internap and see what they can do.
The problem here how much data do you anticipate changing in a single second because that will surely lead to issues with your remote volume keeping consistent and therefore usable in the event of a problem.
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