in all honesty as my signature says "a car is only worth what someone is willing to pay for it" and i personally woudl offer around 7-7.5 for this car since it seems well taken care of. I kow it doesn't sound liek much but that woudl be my "buying price".
if i was the seller i'd not settle for anything less than 8 for it, but that also depends on how much it was bought for and what kind of costs were incurred during ownership. again it's all down to the individual car and how it was kept.
personally i HATE putting values on others cars when i have no intention of buying them since i usually tend to dishearten the seller and some buyers, but i'm here posting this reply on anils request as he wanted my opinion on this car.
good luck with the sale, it's a great looking car.