Got a problem with my car wondered if anyone here can help

After i got my turbo i had a lot of steering wheel shake. It was happening at higher speeds (60+) and during braking. Obviously the disks were warped, so i changed them. However, after the shake was still there at higher speeds. Anyway, had a new AP organic clutch put in, and the shake that was there on the straights had got a lot better (loose bolt somewhere?) but the disks seem to have warped themselves again (had noticed it had gradually come back, assuming its cos i didnt change the pads).

My question is does anyone else get this shake? the local boy down the street rekons i should replace the whole front end (rack, rods, bushes etc) but my local garage (who is very good) says theres nothing wrong with them and that its probably my wheels ( 17" 205 40) that ive got on there.

Should say too that ive noticed its hardly there on smoother motorways, but is very harsh on bumpy twisty mountain roads.

Cheers in advance