While the FSD's are supposedly pretty plush (variable damping) they've had some quality issues with the placement of the lower spring perch on some resulting in cars riding higher than before even with lowering springs..Doh!
Koni yellows are comfy too, but it will take some experimenting to get the damping right for you as they are adjustable. Bilsteins, IMO are a perfect match for the TT. Do some more reading before you choose.

You'll most likely need Front strut Bushings and bearings, and probably a good idea to replace the sway bar droplinks all around. All other bushings (lower control arms, rear arms, etc) should be inspected for wear and cracking. Rubber gets hard over time so to really do it right they should ALL be replaced.

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photos at the Fotki Here... TT FAQ's Here......email Steve at the shack!