Best Ultrabook to use with Ubuntu out of the Box

Hi to all, i want to get a new ultrabook, samsung, lenovo, toshiba, asus and probably acer would be my choice of brand. It has to work well out of the box with Linux.

i use as my day to day distro, ubuntu, but will try when it gets available, elementary os and use also Sabayon linux to experiment with gentoo.

I would like for it to have not to shity speakers, at least core i5, nice display, and backlitt keyboard.

it wouldn´t hurt if it is not so expensive.

please help me with some good links/suggestions.