I don't suggest you go with cable. You'll lose out on the SLA and QoS that comes with the T1. T1 is dedicated service .... cable is not. So you'll lose reliability guarantees that are part of dedicated circuits.
Do you know if ethernet is avilable in your area? That would be more cost effective than a quad T1. There might even be a lower price in quad T1 from another provider .... or possibly a fractional DS3.
If you'd like ... we can dig into your options for you. We have inside relationships with top tier providers (no Kmart vendors) and can get better price points than you can talking to them directly yourself. We'll look for the most cost effective solution for your requirements.
If this is an option you'd consider .... just submit your detailed requirements in our web portal to create a support record. We'll take it from there.
To alleviate any reluctance ... you should know that our services are no cost to you.
Just go here to create the record:
Bandwidth Solution
I hope that helps a little bit.