So, I'm completely new to Subaru's and I've found a really nice 1998 Impreza 2.5rs for sale. the only thing that I was told it needs is a head gasket. The guy bought is brand new and is in his late 50's, so I'm pretty sure it hasn't been ran hard. He's only asking $1000 for it, it's blue with the stock gold rims, and has small rust spot on the front fender. I do know that i KBB value for a 98 Impreza 2.5rs in fair condition is $2700. Should I talk to my mechanic to see what it'll cost to have the head gasket replaced? being that he's only asking a grand for it, so I be a little concerned that there's more issues than what he's saying?

Any help would be appreciated!