The power supply will most likely be fine. One warning: that videocard is PCI-E and will probably require a PCI-E power connector. Your Enermax is probably older before PCI-E power connectors were out. The videocard may come with a PCI-E power adapter so it works with older PSUs, but it might not -- make sure it does.
BTW you're not getting ripped off. That is a decent deal.
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