what to ask? [used eclipse]

I'm really new to cars [this'll be my first one] and today I saw a REALLY nice eclipse. I think it was a 95-6, not sure if it was GS/RS/etc.. so I gotta ask about that, but I don't know what else to ask about. Here's what I know about it already:

Miles: 64k
Stickshift
Pioneer audio [all he said was "It has a graphical dash cdplayer" so I need to get him to elaborate on that..]
Good int/ext condition
Price he's asking: $12,000 OBO
Green ext/Black-grey int

I'm calling tonight when he gets off work and I'm not sure what to ask about, so can anyone gimme some questions to ask to find out what a good price is to offer?

Sorry if this is wasting your time, but I gotta start somewhere :\

Thanks..