I'd recommend a quality product before getting into the features. CX is a budget PSU, not recommended for high loads, even wondered why the caps are said to be low quality? They us CapXon, one of the worst cap manufacturer, and simply put, their caps melt on continous high load, not only resulting in PSU failure, but even risking other components.
Modularism is a feature of PSU, not a deciding factor unless the OP has extremely tiny case, and even then I'd avoid CXM. If your build works on a low quality PSU, doesn't mean its a great one. The fact remains, as mentioned, the caps of this PSU are low grade, and just won't be good for SLI setup which puts high loads on PSU.
EVGA B2/G2 or Corsair AX/TX/HX or Rosewill Capstone or any SeaSonic or Antec (700W+) are great PSUs, much better quality than CX. And almost all except some Corsairs and Antecs are under $100.
It's better to be safe than sorry.