I like the white background with the blue eagle/writing the best. It just seems so pure and elegant. I absolutely love the eagle design - it's very determined yet is so free looking. I definitely think an eagle should be our main logo if we have one and yours is really well done. Throw the words "Peace, Prosperity, and the American Dream" on there below the eagle and it would evoke a lot of strong feelings amongst people. I think the design is something that could really apeal to conservatives and independents and would contrast nicely with Obama's mass produced, collectivist looking logo.
Also having a plain white background for signs with just blue and black for the name and eagle would allow us to print a lot of signs very cheaply. Plus the white stands out amongst all the other blue yard signs.
And a white bumper sticker looks good on almost any color vehicle although I do like the idea of allowing people to customize what colors they want.
Branding is important. Just look at the new SarahPAC website:
http://www.sarahpac.com/ The mountains, big sky, and free frontier feeling is definitely something that conservatives/libertarians everywhere can connect with if you like Palin or not. I like that theme moreso than the Philadeplphia, founding father-esque feel you get from Liberty Pac:
http://www.libertypac.com/