Cox Small Home Business, where do I inquire about this?

"Do these residential business plans have a data cap themselves?"

Most Cox Business(CB) Internet plans I have heard of do not have data caps. The network, and thus your bandwidth, is still monitored for "unusual activity", but that's more for maintenance purposes then to appose any kind of restriction. 

"What are the different plans?"

The plans seem to vary more state to state then the residential. Here is one site that gives some pricing. Here is a PDF explaining some of the features and a site showing the different tiers. Be sure customize it to your area by putting in your Zip code in the top right. 

While CB internet has it perks, like multiple IP's to allow open NAT gaming, and same day technicians, there are certain things you also need to consider. First, assuming you wouldn't be keeping your Residential internet plan, you would lose everything that is attached to it. This includes your @cox.net email, and although you would be provided multiple different email address, the domain wouldn't be the simple user@cox.net you may be used to. You would also have to change over to the CB equivalent of any data backup or Anti-virus you use of Cox's. You would also loose access to certain streaming media outlets that Cox offers, like the "Advanced TV" and ESPN.go.com sites, but sites like Netflix and YouTube would still work normally. Last, you might lose certain discounts that come from having all 3 services with Cox Residential, although I have heard of some Sales representatives getting creative with that.

"didn't give me anymore information regarding where I can learn more about these plans."

See Contact Info below. Hope that helps 

Sales Department: 1-866-456-9944
Sales for multiple-location businesses: 1-877-669-3038
Customer Care: 1-866-272-5777
Technical Support: 1-866-272-5111