flat-bar hybrid $400 range

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I have a mountain bike that doesn't cut it on the roads. I am looking at hybrids. I have 3 children to support, so I am not looking to break the bank. I am looking at Trek fx2, Giant FCR 3, Giant Cypress. I plan on spending under $500.
Any ideas?

I have a mountain bike that doesn't cut it on the roads. ... I am not looking to break the bank. ... I plan on spending under $500.
Any ideas?
What make & model mountain bike is it? How about fitting a set of narrow slick tyres to your mountain bike for road use?

Otherwise a Giant CRX4 (FCR4?) is probably a good choice between cost and something good for the road.