The ThinkPad E570: Fast Linux Laptop at a Low Price
ThinkPads are known to be stable and great for running Linux on. This Cyber weekend, Lenovo has large deals on their laptops, and the E570, a brand new Laptop from Lenovo, is included. At the lowest end configuration, the E570 has the i3 processor, 1366p display, and 4 gigabytes of RAM for $450 (normally $600).
I bought one of these for myself on Friday at the highest end configuration, with the i7 3.5Ghz processor, 16gb of RAM, and a 1080p display for $720 (normally $960). The laptop has a slightly bulky design, but overall, it looks quite nice.
Sadly, Lenovo has still not started shipping laptops with Linux installed, but you can always use your Arch Linux installation disk before booting up Windows.