Auto trader is grand - bought both my cars through that. I had a Fiat Punto. Nothing went wrong with it (engine wise) but the build quality was appalling. Great to drive though! I then test drove loads:
Audi A2. Beautifully finished. More storage than you'd think. Drives like a rollerskate so is a total hoot. But, I'm 6'2" and it felt a bit cramped. Expensive servicing.
Seat Leon (last version, not current). Reliable, nice to drive. HUGE boot. But, dodgy plastics inside and when I was in the front seat no one could sit behind me... Cheap though.
Alfa 156. SWEET to drive, absolute joy. Loads of kit, really comfy. But, turning circle of a cruise ship and apparently unreliable (though not as bad as you might think). Quite cramped for those in the back.
Renault Scenic. My one broke down on the test drive - but it seemed nice. But that obviously put me off.
VW Mark IV Golf. Easy to drive, roomy, lovely build, built to resist nuclear war. Big boot, very safe. Dull to drive.
I bought a 1.6 Golf SE - air con, cd etc and fits all our and DS kit in boot. Dull to drive but was under 6k.
HTH
M