I just buy whatever's available and cheap, including the car that I bought last week. I found out just before Christmas that I was going to have to scrap my old Saab because it was only running on three cylinders. The guy at the garage (who just sells a handful of cars each year) said that he'd have a Honda Accord arriving in January and that I could have first option on it if I wanted. When he got it on in, he gave me a phone call, I looked it over an hour or two later, took it for a 10 minute test drive and agreed to buy it. I didn't even bother looking at any other cars.
The Saab I had before that was purchased in much the same way. My previous car was destined for the scrap heap and I just said to the guy at the garage "Have you got anything for sale at the moment?". He replied with, "Only this Saab". A few minutes later, after just a 5 minute test drive, I bought it from him.
Most of the cars I've had in the past have been bought in a similar way. When I worked for a Ford main dealer, and was able to buy any trade-in vehicle for just £50 more than the company had paid for it, I bought an Escort without even bothering with a test drive at all!
I'm not exactly the fussy sort really, am I?
;-)