I've now been to 3 Dim Sum houses in OC. Here are my opinions on them:
1) Sea Food Paradise - Westminster
Head and shoulders above the other 2. The best turnip cake of any dim sum house that I've ever been to.
2) China Garden - Irvine
OK if you're in South County and don't want to make the drive to Sea Food Paradise.
3) Dragon Phoenix - Westminster
OMG! Absolutely the worst Dim Sum house that I've ever been to.