well, saturns can run foreever, but it is maily determaned by the amount of care they recieved early in it's life, something that you really have no control over. take my wagon for example. '94 twin, automatic. 205K. sure i abused the thing by racing at and whatnot, but it it got it's oil changes, brake service, coolant flushes and all that. and thats why it lasted as long as it did.
if it were me, i'd put the money into it. i am in the (long) process of replacing the whole drivetrain in my car, rather than buy another (which would cost the same.)
i like my car. as you must like yours. if you put the money into it. you'll get it back.
however at 170K i wouldn't just change the clutch and the head gasket. i'd give it at least a minor refurbishing.
pull the engine, clean it up, replace the clutch, alternator timing chain water pump starter, ps pump ect.
if it were me i'd go one step further and strip it down, check and replace the bearings and piston rings. put it back together with new belts hoses and fluids, run it on synthetic and shoot for the 400K club.
good luck guy... | 
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