All three sell laptops that you can configure to your needs. I personally went with Xidax for my laptop build, and it's freaking amazing. Plus I managed to get a 3yr warrantee upgrade for free.
Not sure what ya mean .... websites present a working build and let you edit it as many users wouldn't necessarily know what was needed orn what is compatible.
I have bought a dozen or so there
http/www.lpc-digital.com/
All customizable lappies start out with a "base build" .... you add or improve what ya want.
I don't think there is such a website but in case there is It's not very popular, check xoticpc, sagernotebook and cyberpowerpc, you may find a good deal in any of these websites
All three sell laptops that you can configure to your needs. I personally went with Xidax for my laptop build, and it's freaking amazing. Plus I managed to get a 3yr warrantee upgrade for free.