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I agree with your idea. If we're going to trade for an impact talent it would need to be for 3 years+ or a Cliff Lee type no-brainer.
I don't like Ethier in particualr though. Hes poor defensively and very Ibanez-ish overall. Above-average, 2+ WAR type, but not an impact guy and about to escape his prime. He wouldn't fit in LF at Safeco and would be a pricy DH.
Reyes and Fielder fit more in the impact mold, but like you say they are FA after this year and you don't want to be trading for rent-a-players this year.