Thats cool. Plenty of bandwidth for you. I don't have bandwidth issues either with Comcast. 6 or 7 Mbps down 2 up. 5 computers (4 on Linksys/Cisco wireless N network) I max out at 270 Mbps on the wireless LAN. 1000 Mbps at the hardwired hub. In addition on the wireless network I have PS3, XBOX 360 and a Wii.
I could have that all fired up at once still download enough porn in 60 seconds to make you go blind...Ain't technology fun?
Coax copper does have bandwidth limitations especially if distance is involved.