Bathtub advice needed for rental

[Virginia Jones]

A rental we are renovating had a cheap, flimsy stand-up shower in the only bathroom. Since the house only has the one bathroom I was thinking we should probably go with a bathtub/shower combo. 

We will be doing the installation ourselves (husband and I). I've read the reviews on the cheaper units that are at Lowe's and there are a lot of unhappy people. Does anyone have any suggestions on what type of material we use? (fiberglass, acrylic, etc.)

Also, what are your thoughts on having only a shower option in the only bathroom of a rental?