Understated,
Sounds like you are in Canada.
Skip MSI; they have not been getting much of a reputation for solid, reliable, laptops for video editing.
Asus is selling rock-bottom priced laptops if you really need to cut cost to the bone.
My first choice recommendation would be to go with an ADK laptop. They are a audio/video editing centric company that has excellent laptops (Sager / Cleo platform) and excellent support for pretty decent prices on high-spec configurations. Unlike the HP/Dell laptops, their 15.6" 1980x1080 has expansion for multiple drives while retaining your optical bay.
HP and Dell are OK too, but more expensive for fully loaded configurations. Both companies provide a really nice base model, but then charge a lot for adding memory, drives, etc.
Dell provides really decent CPU choices, but you need to go to the "large business" section of their web site to see those CPU choices for the M4700.
If you go HP or Dell, get a newmodeus.com optical bay drive caddy to put a 2nd internal drive in your system. Buy the HP or Dell, then move the HD to the optical bay and buy a large SSD for OS, programs, and scratch/cache.
Regards,
Jim