I have three Smith Corona Electras, a 110 and two 120. I like them a lot, but when it comes to build quality they pale a bit when compared to an Olympia SGE 35 I briefly had (I didn't keep it, though, because it took film ribbons, which are damn near impossible to find around where I live).
I'm looking for another Olympia 35 but, again, they are as hen teeth. That would be my desert island (provided it had electricity, of course) typewriter.