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If it's a temporary move, and you plan using the sites for something else in the not-too-distant future, use a 302 redirect.
If you want to indicate a permanent redirect for these domains, use a 301 redirect. I'd pick the 301 as a preference. There was some talk about 302 redirects being exploited to steal Page Rank - this was for off-domain 302 redirects, on-domain 302 redirects were apparently fine. But that hijack stuff is something I have no first hand knowledge of, maybe someone else can chip in if they know more. So I'd pick the 301.
If the domains have Page Rank then the 301 will pass it on to the site you have redirected to, so that's good.
It won't hurt you, anyway. You could also do a meta-refresh set at 0 seconds which (generally speaking) is seen by the engines as a 301 redirect.
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Clean, Fast and Tight
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