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ORIGINAL: engnrng

Original owner, 2003 Seville SLS, check engine soon error codes are telling dealer there are problems with the torque convertor engaging at highway speeds (a "fifth" gear according to trans tech).  Probably explains my wife's 10% drop in average mileage over the last few months.  Tech said usually replacement parts are about equal to a new trans, may just want to put in a new one.  He has seen this often enough for it to be "usually"?  Anyway, he was surprised at only 70k miles, but others that have needed new trans, including 2 Devilles, both over 100k miles, were the result of mostly freeway driving (I guess where the lock-up is working in and out a lot).  My wife has about 85% freeway driving.  Will replacement/rebuild trans do the same thing in another 70k miles, so we should get rid of car before then?  Unfortunately, we did not realize extended warranty was essential on Cadillac - this is our first.  With the failed water pump, crank sensor (she narrowly avoided an accident when that caused the engine to stop on a bridge!), brakes, premature battery failure, what can we expect next if we fix and keep the car?  She loves driving it as long as it works reliably!  Does the new CTS have better engineering?  Not really ranting, just seeking some help deciding whether to stay with Cadillac or go back to Toyota. 

Any thoughts, recommendations, advice would be much appreciated.