You are correct in your assumption. The CX series is Corsair's budget line and while they are very good budget power supplies they should be used as what they are. I would not use one in a higher end power hungry build. The Antec EA 650 is a very good unit made by Delta with a solid reputation.
Antec gets a 9/10 jonnyguru.
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=110
There may be better units available though depending on you needs and budget. If you post system specs, budget and place you want to buy from we can look.