I am having the same issue. Did you find out what is was?
My gs300 is still under the 4year/40k mile warranty so I'll have it checked out.
Thanks
First noise sounds like a bad tire or wheel bearing, have it checked.
The clicking noise can be fixed by installing a front brake pad "Fitting kit" the dealer will know this terminology.
The third, "pebble" noise sounds like clattering, Are you using anything other than premium fuel? These cars hate low to mid grade fuel. Also, I recommend an induction cleaning, should be offered by your dealer.