Toyota Camry: Your thoughts?

Hi there:
I have a '93 Camry V6 LE with 193k km. For a while I have been having
this problem with the front end - there is a thumping noise going over
the unever road (pretty much any road in Montreal area), seems to be
happening when the wheel(s) are moving down - say, after the tip of the
speed bump. Stabilizer bar bushings are new, rubber rings (isolators) on
the struts are new, struts are year old Sensatracks, upper bumpers on
struts are new. Wheels are firm when car is jacked (no play). So, I'm
running low on ideas where to look next. Suggestions are welcome :-)

BTW, car was with dealer some months ago, and they quoted 1200+tax to
replace the parts mentioned. Have I missed something there?
TIA,
Zbysko

Daniel M. Dreifus wrote: 

Thanks Daniel;
When I replaced the rubber spring seats (insulators, as Toyota calls
them) I looked at the mounts, admittedly not in detail, but they seemed
pretty much OK. I was not aware that there is a bearing inside the
mount, I thought that strut body rotates arond the damper shaft, which
would then be fixed at the top. Thanks again for the tip, now I know
what to do next :-)
And yes, price quoted to me included parts, but that is still way much
more than I paid for the parts (and my six hours of amateur labor)...
Zbysko