

skip the T470, T480 with 8xxxu cpu is the lowest you should go; the hardware is practically identical (and interchangeable!) but the CPU is a huge difference. also if you find them for cheap, there’s T490 (refresh), T495 (AMD Ryzen), and T14 (newer variants of the T4xx series with Intel and AMD CPUs).
the 12" version would be the X280, again single-channel RAM only. in the 12" space you also have Dell Latitude 7290/7200 (just the latitude series, no inspirons and friends) as well as HP Elitebook 820 (and 830) with 8xxx and newer CPUs. Elitebooks and Latitudes are Thinkpad T-series equivalents with similar build quality and features.
there’s this thing: STAR WARS GRINDHOUSE