Best bang for the buck mustang?

[Brad]

My brother is in the market for his first mustang. I bought my fox body about a year ago and dont get me wrong i love it but it does leave alot to be desired. Anyway I have been looking around for used mustangs and the price of the sn95 is cheaper than a fox ( 87-93) and the new edge mustangs are pretty cheap as well. My question is whats the best bang for the buck used mustang between the three gt models for a street car? He is also looking at a 98 Cobra, and he has about $9,000 to spend. So which would you buy and why?