I voted white. Ever since I saw the first white iPhone 3GS I thought it kinda looks...well.. delicious! My friend has a white E4GT and it looks just as yummy, even the Evo 4G with the white back looked nice. I have had nothing but black phones, so it will be a nice change to go white. Also, the white probably shows less fingerprints than a darker color does. That is one thing I do like about the black E4GT, the only fingerprints it shows are on the glass.
The blue that Samsung used in all the blobs looks a lot lighter than the actual phone. Had they used that blue on the phone I might have went with that. It will be interesting to see what the blue looks like when I hold it in my hands, but as for now, I am going white.