Porsche Boxter S, 986 or 987?

[Hark]

Ok feeding on from the Elise testdrive, lots of people said to test drive a Boxter S. Now looking through the classifieds you the 987 would be the top end of my budget at around £18-19k

Something like this I guess:
http://www.pistonheads.com/sales/1798481.htm

BUT... you can get a 986 for at least £5k cheaper, similar mileage.

http://www.pistonheads.com/sales/1809828.htm

Reason I ask is tha if I go for the 987 I would finance about £8k, so not far off £200 a month. The other one would be lower payments, therefore more cash if stuff went wrong.

Usually I'd just try the newer car, but Porsche repairs/parts costs scare me to be honest.