I've been laptop shopping lately, so I'll throw in my $.02.
I'm currently editing on a late 2011 Macbook Pro 15" (glossy screen with external Dell Monitor). This machine needs to be replaced before too long. It suffers from a video card issue which crops up every so often, and the extended warranty expires at the end of the year.
The latest model Macbook Pro is an option of course, and a very capable machine, but I have a really hard time wanting to pay full price for a machine that was last updated in May 2015. It's anybody's guess when the next MBP update will come and what it will look like.
For me, I've been looking for something around 14-15 inches that I can use with an external monitor, be reasonably portable when needed, and capable of light video editing. These are what captured my attention:
Asus Zenbook UX501vw - This one stands out for Price/performance ratio and performance/battery life ratio, and performance/portability ratio.
Razer Blade - This appears to be an insane gaming laptop somehow crammed into a really nice looking 14" chassis. Looks amazing with a Geforce 970M, but the big concerns would be heat generation and fan noise...also a glossy screen.
Dell XPS/Precision 5510 - The XPS uses a Geforce 960M and the Precision models use Quadro cards. I personally lean towards the Precision models, because I think the Quadro M1000M is a little more balanced in this chassis in terms of heat and power requirements than the 960M, although it is a little less powerful than the 960M.
Dell Precision 7510 (or possibly 7710 in your case) - These sacrifice portability for some nice expansion and upgrade options. There are reports of some issues with the 1080P non-touch screen option.
Lenovo P50 series - This is as close to an old school workstation as you can find, with plenty of pro features (even a built in X-Rite colorimeter is an option. Definitely a different route than a Macbook Pro or a Zenbook, but you can pack a fair amount of hardware into it, and won't be lacking ports.
Macbook Pro 2015 - As I said, I don't think the current MBP ranks too high for value at the moment, but it is still an extremely capable laptop for photo editing, probably has the best trackpad in the industry, beautiful design and very portable. Honestly, if you're looking for a "light editing machine for travel and occasional use and you have the money, the MBP would be an ideal option. My 2011 (with an SSD upgrade) still runs LR just fine. It has a glossy screen, but it has a coating that minimizes reflection. You can find them ah BHphoto for a little less than you'd pay at the Apple store.