hi, i've a recent thread in members motors of my stilo and mk1 sporting - look it up, the finished article may give you ideas.
as above really, suggestions are quite usual - it does indeed depend on your budget - in no particular order, i'd go for the "fiat standard" look of;
- full abarth bodykit (see classifieds at mo for GREAT "pingu" price on bumpers...)
- anthracite alloys from a gt (though yes, dark car may suit whites...)
- headlight lense protectors
- lower car slightly
- tidy up any parts of bodywork if required
- clear side repeaters
- subtle abarth / scorpion badging
thats all i can think of, in terms of my preferences.