Yes, they make a CX750 and a CX750M. I just saw them at Canada Computers day before yesterday so I assure you they exist.
Am I? The CX series has pretty bad ripple and it's not good quality. I've had 2 of them roll over and die for no reason in systems I've built for people. Your offensive comment is unwarranted and not appreciated. How can you say that any bronze rated rock bottom entry level PSU is a great PSU? None of them are great. CX series is pretty rock bottom for bronze PSUs
Besides, what is the point of suggesting a bronze 750 when he can get a Gold 550 for the same price? And he only needs like 400W to run the system? Not just a gold 550 but a high quality gold 550 with a good track record. Ask around. Corsair CS, RM, CX and TX, but CX specifically like to roll over and die before their time. Seasonic may make a lot of Corsair PSUs but they don't make CX.