Great post @Bill Bodziak for this post I would suggest just going with the shower rod, one that bows out to give you that expanded feel. Keep cost down and do a simple vanity, new toilet, an over head recessed light, and simple white subway tile all the way up, or throw a shower insert in there and be done.
I have a rental that I'm keeping long term, I did a $1400 Mr.Shower Door assembly, thicker glass and frameless. If it was a flip I may still have gone with it, but these days you just never know what the buyer is thinking.
For example, my day job is property management. I help my company with two buildings, one has shower doors, the other does not. The building with shower doors, during tours, prospects either love them or hate them, there is absolutely no in between. Granted the buildings shower doors are the cheap Home Depot ones, with ugly frames and frosted glass.
My real estate teacher once told me, buy cheap and rent cheap. I prefer the latter, buy cheap, fix nice, rent high. This is also dependent on neighborhood too.