99 GSX Weaknesses...

Im looking at a GSX, whats some stuff I should watch for? or check when looking at it?

crankwalk, if the car feels funny when shifting then it might have c-walk.
also look out to see if the turbo is worn out.

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are there any signs of the turbo being worn? like something I should notice?

to check the turbo for shaft play, take the air intake off at the turbo, put your finger on the shaft/wheel and see if there is any movement. VERY little is normal, if there is alot than it needs rebuilt/replaced.