Before we get into "which year is better junk", can I ask a question? What are your daughter's requirements? A V70 has poor visibility because it rides so low compared to every thing else on the road. There is no room to car pool sports team members. Gas milage is ho hum. There is no privacy glass in the rear, so anything back there is vulnerable to theft.
Could I be so bold as to suggest a Honda Odyssey? Good seats for the kids, power doors, safe, etc. And about the same price as a Volvo with the same milage.

Now, V70.

V70 N/A, GLT, T5, R. Gas milage decreases with power. And the suspension gets more truck like with more poser. 1998 is the last year where there is a throttle cable. 1999-2002 have ETM problems, covered by the factory for 10 years, 1999 is 9 years old.
Don't get AWD before 2003.
1998 - 2001 has evaporator problems, 10 hours of labor to fix.
ABS and other electronic boxes fail.
Window switches are not water proof and will get replaced sooner than later.
No side curtain air bags until later, not to be confused with SIPS which does not protect the head.

Dealer service is very expensive, and needed often. DTC scanner is a must, but that doesn't cover Volvo specific items.

Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)