The rebate is just $10, even without it the PCP is a good deal. I'm not so sure if it makes much difference whether the PSU is super quiet or not if the rest of your build isn't geared towards quietness. In any case the PCP is quiet unless you really stress it. At common loads you'll be fine.
Which Silverstone is that? You don't really need a 700W unit anyway, 600W is already "future proof" enough (bear in mind though that power consumption tends to go down these days).
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