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In my experience, buy the best single card you can get before buying two of a lesser variety. Quite a few operations do better with a single killer card if buying two means you had to compromise the video RAM, clock rates, etc. There are always some benchmarks that look better with two, but for uniform gameplay the same money in one card is more effective.
As for "SLI certified", it's a sticker. Many companies make PSUs with more than adequate specs for a loaded SLI system. Buy something with enough connections and adequate current at each voltage for your total system needs. Buying a reputable brand means there's less chance it was spec'd & tested in a refrigerator (you won't have to double your current requirements for safety).
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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