Site to Site Scenario and Issue

Hi. Currently have 2 SG 210's at Site A and 2 SG210's at Site B and 2 SG210's at Site C. Here is my current scenario:

A<-->B IPSec using RSA

A<-->C SSL Site to Site

Site C has a requirement for higher bandwidth through the Site to Site for DR site at A. SSL is inherently slower than IPSec in my experience. From what I understand I cannot have 2 IPSec Site to Site connections using the same or different protocols(?) Certificate, RSA or Shared key. Would putting a RED 50 behind the Site C SG's help in this scenario?

Site B DOES NOT have to communicate with Site C ever.

Any suggestions on what I can do in this case?

Thanks