I have only ever owned 1 car in my life that I paid more than £500 for, and even that was a bargain it was a 1987 BMW M3 (E30), that I gave just shy of 3 grand for.
The others.
1991 BMW 316i Coupe (E30) - £113-Bought it with some slight front end damage, put that right and it was a great first car, even if you could hear the pound signs rolling up in the insurance company's eyes when I called for a quote. Can't remember exactly how much but it was something like 10x the value of the car.
1989 BMW 318i Touring - £495- Bought because the ex-mrs wanted "A car with 4 doors" when our first child was on the way. That was treated to an engine swap, the standard M40 B18 came out and an M42 B18 (from a 318is) went in. Owned it for 3 years with no faults, until some *@%$*@£ ran a red light and bent the sill and b pillar on the passenger side. Was absolutely gutted.
1989 BMW 318i Touring - £490 - This one was red, absolutely faultless, should have never sold it.
1997 BMW 316i se (E36) - £500 - Lovely car like all Beemers a grin monger to drive. a little down on the power side, but I was having too much fun to care.
1997 Volvo V70 - £250 - It was a 2.5 5 cylinder Audi engine, and went like a stabbed rat, despite weighing in at 1.7 tonnes, bags of room for the family.
Current 2001 - BMW 318ci se (E46) - £270 - I had to scratch the Beemer itch so I took a punt on this, it was cheap for a reason, but none of the issues it had when I bought it have been hard or expensive to fix, it's a 2 litre so has plenty of power for me and it loves back roads as much as I do. The fuel pump is on its way out at the moment, but with the community surrounding these cars I hae one on the way and not too badly priced, so still in the good category.