I've got a 5k budget at a push and although I really wanted a Honda Jazz for the boot, the insurance is quite high and they're expensive - can't afford a model below 50,000 with air conditioning.
So:
I have 2 kids, a 5 year old and a baby. I need boot space but cheap runner and low insurance. Shortlist:
Hyundai i20 - seems to have a lot of extras and could get a decent lowish mileage one in my budget
Skoda Fabia - but I really hate how they look 
Nissan Note - but would struggle to get one under 60,000 miles
Kia Venga - though quite rare here.
Any experience of the cars above? Any wisdom appreciated.