I wouldn't be too concerned about the rear disc brake problems with the i10 - Hyundai developed new brake pads to prevent this issue so it's easily fixed, and most effected cars will have had the work done now. Indeed, the i10 and Kia Picanto are both excellent little cars with reliable automatic gearboxes. The Suzuki Swift might be worth a look, but there aren't as many about as the i10 or Picanto. Also consider a slightly bigger Honda Jazz or Nissan Note.