Have you tried contacting Savvis directly? Most large carriers won't do anything less than a full cabinet, but they should be able to steer you to a reseller/customer in their data center if your needs fall below that.
If your looking for direct Savvis bandwidth the less expensive route to go would be to Colo in the Dallas Equinix at 1950 Stemmons Fwy. Then purchase a Fast E port of Savvis via a reseller. Savvis just started offering fast e services at that location. Is there some reason you need to be in the Fort Worth location?
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