What is the best and most affordable cruise line?

asked:

Me and my husband are looking to go on a cruise in Aug.2010 for the first time. We have been looking at different cruise lines and kinda feel overwhelmed. We are planning to go to Western Caribbean for 5-7 days. So far Carnival has decent deals be we are looking for suggestions on other that maybe better. Any help would be great. Other suggestions of destination are welcome as well.