Assuming that you have £50, and the Fabia wiper is about £20, this leaves you £30.
Based on that I'd either:
a) save the money until you have more
b) buy some uprated dogbone bushes (think you may get these for sub £30)
c) buy new number plates (sounds ridiculous, but makes the car look fresher)
d) add £16 and buy a Mk1 S3 upper strut brace (and fit it next month)
e) buy a panel filter for £27 and smooth your airbox by hand for free
f) Caliper paint
g) Upgrade all your bulbs to something that looks a bit more trick (whiter lights)
Nothing else comes to mind......
Whatever you do, don't spend it on e-bay on mods like this:
COOKER KNOB