I replaced mine with a second-hand lenovo t480s and it's the best laptop I have ever owned, by a huge margin. I'm astounded how good it is. Paid A$500 (~$USD 350) for it.
Installed linux, everything I care about just worked. (I don't care about finger print readers, maybe that just works too? Hate it either way so dunno).
I set the power setting to "power saver" on the incredibly obvious and discoverable gui selector and I get 10 hours out of the battery. A battery which I did not even replace. You want me to list annoyances, well I can, and they're all minor and all to do with choices that my linux distro made.
Now I've heard brand new lenovos aren't as well supported as 2-3 year old models and I've been hearing that for more than a decade so there is probably something to it. Seems like enough linux devs use them that it shakes out really nicely in that 2-3 years.
If this one exploded I'd probably be looking for another one just like it second hand.
Can't tell you about other T series or X1s or all of the other wild and wonderful lenovo "thinkpads" some of which those who claim to know say "thinkpad yeah, but not really..." Just the T480s I'm saying here is a beautiful machine.
So that met my specs. But what to do is go to the relevant thinkpad page on wikipedia [1] and all the models and specs are listed there. Use it to look through the places where you get ex-corporate and ex-govt laptops. Find the thinkpad that meets your needs. Vastly cheaper sure, but don't overlook just how much /better/ and higher quality it is than anything Dell have for sale. Support won't be worse if something breaks either. I can burn through 4 of these for the price of a Dell but somehow I doubt that will happen or anything like it in the same amount of time as the Dell was actually working.
Seems like you can close it and stick it in your bag like it's a laptop too, which you can't with the Dell because it isn't despite the advertising.
[1] eg https://en.wikipedia.org/wiki/ThinkPad_T_series