02 Accent Transmission issues

my girlfriend has an 02 Accent with 60, 458 miles on it. We have had the vehicle in the dealership three times with different (what i feel anyway) transmission problems. Just today the dealership replaced the
Input Speed Sensor, b/c of a code from the Pulse Generator (which was replaced a year ago). Is this a sign of bigger problems in the near future? Or are these wear and tear issues? Also I was going to change the plugs on the car and wanted to know what plug people recommend I use as replacements.
Thanks!
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Don't sweat the pulse generators. These are the input/output speed sensors we were discussing a few posts down. It doesn't indicate anything serious with the transmission itself.
As for the plugs, I fully recommend NGK.
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