Nailing down a high-quality mouse sensor is tricky without getting hands-on time with a given mouse. The two key sensor types are "optical" and "laser" sensors, but you can't apply absolutes when judging them. Your best bet is to try out a mouse in person, or to rely on formal reviews like ours, as well as online forums, for the skinny on how a mouse feels in specific play situations.
These budget systems typically won't include a lot of gamer bling like customizable RGBs and multi-zone keyboard lighting. Many will cut necessary cost corners by using a plastic chassis instead of aluminum, and you won't see sexy thin bezels like those on the MateBook Pro or Dell XPS 13. You'll also get, at minimum, 3 USB ports, an HDMI output and standard headphone jacks.
Updated Nov. 25 at 5:45 a.m. ET: You can snag some inexpensive gaming laptops for great prices through Cyber Monday. The Lenovo Legion Y530 is on sale for $100 off from Best Buy, while the 15.6-inch Dell G3 can be had for $649 from Walmart — a savings of $350. The Dell G5 is also on sale for $899 from Walmart ($400 off!) A sale at eBay knocks the MSI GL63 down to $969, for a savings of $229. Check out our Cyber Monday hub for more fantastic deals.