[Business] Comcast business connection

I'm looking for a internet connection for my office in Alexandria,va and looks like comcast is the best provider available when it comes to speed. On the business plans do they still require you have that cable modem/router device from SMC if you have static ip's? -- XenServer6.2 x2/ MacMini 2012 2.3GHZQUAD 16gigDDR3 / Synology1513+ (24TB) / HP Procurve 1810G-24 Managed/ (ddwrt)LinksysWRT350N/WG T10 on Fios75/75