When should I take boards/start a new job?

I will be graduating with my RN (assuming I pass boards) May 22, 2008! So I am presently in a contract w/ a health system that sponsored a section at the community college I go to, which means after I graduate I get hired at one of their 5 hospitals and give them 2 years full time employment. Some think this is a bad deal, but for me it just works.
So my decision is....should I start working July 1st and take my boards in August? Or should I take my boards mid-July and start working August 1st
Of course the recruiter for the hospital has told us that it only helps to pass your boards if you start working right away. But I wonder if she is a little biased...
I am leaning towards taking my boards sooner rather than later...like July-ish. But I just wanted to hear some feedback from those who have been in this position already.

Many Thanks!!