NAC.net and Superb.net (or SuperbServers.com) both offer dedicated servers with networks that both have large numbers of peers. I haven't used either, so I'd search for reviews on each before deciding to go with one. Edit: I see that you resell for Superb, so I assume you know how they are
He wants something with huge peering. NAC, Superb, Choopa, and Ezzi have many peers (Ezzi has a few of their own, plus NAC, Choopa has NAC and Internap in their mix). For good pricing on Choopa BW, contact the guys at **********.com. GNAX has 3 connections, and while they're really good, they're in Atlanta (away from the requested area), and don't have the peering that the other companies do.