Switching Internet use to Cable from T1

Hi All, I’ll try to be as descriptive as I can be.

I have 50+ users using a T1. With Comcast Business being so extremely cheap the bossman wants to set it up along with our T1 for internet usage and keep the T1 just for our VPN between our other office.

I have a Cisco 1700 connected to a NetScreen 5GT that’s handling the VPN. The 1700 only has 1 CSU/DSU T1 card.

What do I need? I think I will just get a new router and setup an ACL allowing the servers to go out on the T1 and everything else out on comcast line.

Can anyone suggest a router? I would to keep this as simple as possible. Thank you!