I've been using frozen meals from South Beach, Amy's Organic, Lean Cuisine, etc. As long as they're around 330 calories or less, I don't see that much difference in them. As Cassie said, they're ALL pretty high in sodium. Extra water helps. I don't use more than two frozen meals a week though.
Personally, I like the South Beach products. I use their bars sometimes, and they have little 100 calorie packets of wheat crackers that are really nice with a 35 calorie wedge of Laughing Cow Lite cheese. ;-)
"Well," said Pooh, "what I like best --" and then he had to stop and think. Because although Eating Honey was a very good thing to do, there was a moment just before you began to eat it which was better than when you were, but he didn't know what it was called. - A.A. Milne