I think the certified Volvo is worth the cost.

The 70 series had more changes then you mention. Dash and

interior was completly re-done. B pillars beefed up a bit

for better side impact (in 99 the side air bags also protect the

head, to just the chest). Slightly softer ride. Windshield

raked in a bit, etc. Overall, about 2000 changes as I

recall. My wife has a 95 855 and I have a 98 S70 and I can

easily notice many minor changes (the windshield wiper arms

are not even interchangeable).

As far as problems on the 98: If you choose a 98 make sure you

see the repair and service records. Problems in first 18 months

are probably going to be seen. But, after that there should not

be many problems (mine has not required dealer warranty work for

past 2 years). The engine and driveline have been very reliable

(Volvo gets good marks here) but the small things like rattles and

bulbs burning out plauge the car a bit. So, the problems that

put the car on the not recommended list are not major problems like

engine failure, brake problems, etc. If you can live with smaller

problems you would be OK. If you want every little thing perfect

it may not be the car for you.

98 models were available in 97 (I purchased mine in April 97)

so be careful in that a 98 may be older then you think.

Owning and driving both, I'd opt for the 98. But itwould be a

51% vs 49% sort of decision for me since I would be happy with

either.

Whichever you choose, you should have the dealer run the VIN

and checj to see that any recalls have been performed. All

years have recalls and they are typically safety related and

should be addressed. On the 98 the light switch was recalled

and the passenger side airbag required a better ground. Don't

know about 97s.