If you are looking for reliability you should go for a Tacoma instead. Toyotas have a reputation of going well over 200,000 miles with minor repairs and basic maintenance. Ford was not so good in the reliability department 10 years ago. But then it mostly depends on the care taken into maintaining the car. And if you are going to get a 10 year old car, it will probably have a lot of miles on it. But the main thing you want to check before buying any car is that it has had regular maintenance and that it has had all of its major tune ups ad the manufacturer recommended mileage.
For reliability comparisons you can check out websites like this that have the stats on reliability.
http://autos.msn.com/research/vip/Reliability.aspx?year=1999&make=Ford&model=Ranger&trimid=-1