1990 and earlier 911's i'm considering.. need advice !

Hi Everyone... i'm interested in picking up an 80's or 1990 911 for a weekend/nice weather fun car.... i've located 3 different ones and
wanted to get opinions/advice on reliability and such on these models... before i list the models i wanted to say that all appear to be in very nice shape with normal/average mileage for their years but again i know that a ppi and seeing them in person would be the final steps before deciding... the models are: 1984 911 Targa with approx 92k miles for approx $12k, 1984 911 Carrera coupe with approx 84k miles for approx $16k, and finally a 1990 Carrera coupe with approx 78k miles for approx $15k.... any advice, opinions, etc.. would be greatly appreciated.

Thanks !