Well,if you want total freedom,Libreboot laptop is the way to go.
If you want a newer model laptop,Thinkpinguin is the way to go. The BIOS
isn't completely free,but they make an effort to run everything with free
drivers,and preinstall trisquel.
If you want a modern,fancy, laptop,then you'd have to buy the Librem 13 (not
they charge extra for the kill switches) ,and manually flash Coreboot on it
yourself,then install Trisquel. This should get you to about the same level
as a Thinkpenguin.
Anything else is a trap really,except the boards listed on coreboot (mostly
free) and Libreboot (fully free)