I would listen to Chris over a Tier 1 support agent. Some of them can be...less then knowledgable. But if you wish to buy another modem from them (it wouldnt be a swap since you can only swap leased equipment) here is a list of other Cox compatible modems.
But see for yourself. Basically the modem can support up to Ultimate except in the fallowing markets
- Baton Rouge
- Gulf Coast
- Hampton Roads
- New Orleans
- Orange County
- Palos Verdes
- San Diego
Downstream
Up to 343 Mbps (8 channels)
Up to 43 (single channel)
Upstream
Up to 123 Mbps (4 channels)
Up to 31 Mbps (single channel)