I like the Trader Joe's brand powder. I'm not sure what powder you got at Trader Joe's, but their brand powder always tasted good to me (the vanilla). I tried another brand there in a blue canister and that had a funny aftertaste. Since you did not specify which brand you got at Trader Joe's, I would recommend the Trader Joe's brand with vanilla. Mix it up in a smoothie with some fruit and soy or almond milk.
I really like Jarrow Whey chocolate powder- I had gone to look in Whole Foods at different powders and they were giving out samples. They mixed it with almond milk and it tasted just like regular chocolate milk.
I quite like Spirutein too- you can get individual packs to try different flavours.
I think most powders have a slightly weird taste until you get used to them- I would recommend blending them with some sort of milk (regular, soy, almond, etc), banana and ice to mask the protein-y taste.
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