Its all there it just needs tiding up mate.
The first thing you need to deside is whether you want a sutble styled car ie mostly factory items but with a few choice mods that blend in with the car or do want a very in your face car with big mods like aftermarket kits and bigger wheels?
The choice is yours, kitted cars tend to look rather dated these days unless they are done very well and carefull selected wheels and body mods are bought regardless of cost.
If it was mine Id keep it simple and clean.
1st replace the Lexus lights with Ultra Smoked Jewls as they are probally the classest aftermarket lights out there.
www.cituning.ltd.uk do these for under £70
Next look to maybe some Black Angle eye or Projector headlights to freshen up the face of your saxo, these do come in chrome as well but Black will look more upto date and agreesive.
www.essexracing.com do these as do
www.cituning.ltd.uk
A badgeless grill with Black mesh will also add to the agressive look to the front of the car, look to
www.tuning.co.uk/vauxshop or
www.cituning.ltd.uk for these.
Standard VTS 15' alloys painted Gloss Black will compliment the Black headlights and rear lights nicely and will give the car that real street racer look. 15' rims offer the best in terms of performance/handling and looks.
Replace the large exhaust with a slightly smaller Piper 3' outwardly rolled back box from
www.speedbox.co.uk

(this is a Janspeed 3' Inwardly rolled system but the smaller tailpipe suits the car better and will also sit better than the item on the car currently)
That should really freshen up the looks of your Phase1. Thats my persoanly opinion as that is the look which currently best suits saxos both in Phase1 and Phase2 models.
Hope that helps