Here are the specs we use for XPression Go! Laptops. Go! Laptops are actually used for onair graphics though, so are on the more powerful end.
https://na11.springcm.com/atlas/Link/Document/12442/f1668d87-67a6-e411-b769-d89d67132a6d/9f02cd47-a664-e611-a722-d89d67132a6d
For just designing graphics on a laptop anything with a NVIDIA graphics card (which would include the M series), and a decent CPU (i5 +) will work great. 4GB is all thats required for XPN RAM.
At Ross we all use Bootcamp Macbooks, Dell or ASUS laptops with NVIDIA graphic cards.
Keep in mind that XPression Designer will work in Windows 10 but you will have a better experience with Windows 7.
#XPression