I'm glad you found a used 950 finally, seajewel! It is a beauty!

Too bad Sony isn't making the 7" ereaders anymore. You could get a DecalGirl skin to cover the blemishes on the housing. I have the Oberon K2 cover for my 950, and I love it!
If your books don't have DRM, then you could modify them to get the line spacing and margins that you want. I use the Extra CSS setting in calibre.