Would you consider something a little bigger? A Fiesta-sized hatchback would be more comfortable and more likely to have the features you desire. We'd recommend a Volkswagen Polo or Toyota Yaris. Alternatively, if you do want a small city car, a Kia Picanto or Hyundai i10 would probably be your best option. You can pick up a reversing camera kit from Halfords for around £120 - they won't be as good as built-in systems, but they'd do the job.