Masters Before PhD?

I'm an undergrad senior about to finish my bachelor's in psychology (with an emphasis in neuroscience) and I want to eventually end up in a clinical psychology program. I've applied to three programs so far, but I don't have much research experience (I only did literature reviews) so I doubt I'm going to get into one right now. That being said, I heard I either need to get a masters or work as a research assistant in order to beef up my research. Which one would help me more? And if I go for... Masters Before PhD?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums