When looking to upgrade ( not a derogatory term) from my 4/4 I was looking at Roadster/Plus8 Cars. The low ground clearance and alloy sumps on roadsters was a big issue as we have too many speed bumps and poor roads here. I would definitely get modified sump/ raised mounts/ sump guard on one. My Plus8 has the steel Rover sump...thank God! It has a dent from a large stone that would have cracked an alloy sump.
So....roadsters are good cars but get the mods is my advice. Then enjoy the car....