I'm not a Peugeot man myself but one of my friends has a black S reg 306 gti 6 that he bought about 2 yrs ago, he paid £9500 from a main dealer

I know their a lot cheaper than that, anyway it had full main hist & about 35k miles & he drives it like an old fart, the headgasket blew on it on the way back from TRAX 2004, so i suppose check for headgasket i do believe it is weak point.
Simon.