Try an X220! I regularly use mine on the balcony in bright sunlight and even with bad vision the screen is a pleasure to read. Plus, the keyboard is fantastic, but I guess that's the same as on the X200.
There are mods that allow installation of an FHD display.
I did the FHD mod on my X230 a while ago and can say it makes a world of difference. Well worth the effort of disassembling most of the machine and soldering the mod.
The 51nb folks have also made some other amazing mods like the X320/X330, an X220/230 fitted with a 13" panel: https://imgur.com/a/0m3a1
I have an X60 with slackware on that just runs and runs and runs. It is the screen that I find the limiting factor as OA mentioned. I might summon up the confidence to have a go at the LED backlight hack...