Suspension advice - Shocks and Springs

[strummagnet]

Hello Again.

I have finally got round to taking out the front suspension and i am needing some further advice / guidance. I am actually enjoying it, its frustratingly therapeutic. I have attached images of the shock absorber. The part numbers are: Sachs 81-8903-556-683 Audi 4D0-413-037-CE.

The car has covered 99000 miles, do you think the shock absorber warrants changing at this point? Seeing as i have everything out I thought I might as well do this. It is not looking its best.

Would the springs warrant changing at the same time?

I have a feeling this is going to be an expensive pastime, but then I have classed it as a hobby and the therapeutic value is worth it.