Can't you pick up an XPS or thinkpad with essentially your ideal specs and linux? The one thing is you won't get great battery life on the ultrabooks because they usually have smaller 4 cell batteries I believe.
I love my Chromebook with coreboot and archlinux, but I need a upgrade to a 1080p screen and more than 4gb of ram without having to pay $1000 for a overpriced laptop with a dual-core i7.