choosing used car

I'm driving a 2004 Volkswagen Golf Comfortline 1.4 petrol. I want to either get a new smaller car (e.g. Toyota Aygo petrol 1.0-litre) or a diesel Auris (e.g. 2008). Which would be cheaper to run as everything has got more expensive and my journeys not as long and frequent, plus I travel alone mostly. Which would be cheaper to run?

I am thinking of buying a 2012 Alfa Romeo Giulietta 1.4; how reliable is this car?

What car should I upgrade my 2001 D4-D Toyota Avensis to? I was looking at a Renault Scenic 1.5 dCi: are they reliable?

I'm looking for a 1.6-litre diesel hatchback, any good suggestions? Was thinking of maybe a 2008/2009 Ford Focus or Volkswagen Golf.

Can you advise on what is the best buy (in terms of reliability and economy) in the €3,500 - €4,000 price range? I am interested in a saloon car.

Thank you

Anne

I'm considering buying a Hyundai Tucson 2.0-litre diesel. Is this a reliable motor? Are there any problems with them? What is fuel consumption like?

I'm looking for an economical family car for long commutes, with a large boot and space for two car seats, around the €7,000-€8,000 mark. So far have come up with the Ford C-Max... Any other suggestions?

Kia Picanto: what should I look for when buying a 2007 model and what should I expect to pay?

Would you recommend a 2008 Audi A4 as a good reliable car?

Thinking about buying a used Nissan Almera 1.5 three-doorTekna; is this a reliable car? It's a 2003 model and has less than 70,000 miles on the clock.