Ideas identifying a wobble of sorts

[stilov]

So, driving my 00 Boxster S on a flat smooth surface, seems to ride fine.

When there are imperfections in the road however, it seems that I get a TREMENDOUS amount of steering feedback through the steering wheel. Almost a reverberation.

I bought the car with many updated suspension pieces...dont know specifics, but some bushings etc.

The car has 115k on it, original struts, the steering seems tight, I mean there isn't slop in it, the car doesn't wonder on the road.

I did have the wheels balanced hoping that was it, but it made no difference.

Any ideas? or common problem areas?

Thanks!