Cheap little car that.
ST kit and escossy rims would look the nuts but then will cost a bit and your insurance will sting you.
Personally if I was on a budget then I would look to pick up a cheap set of MK6 Zetec S alloys, clear side repeaters and if they are a straight fit, mk6.5 headlight to freshen the whole car up. Nice little back box and lowered a little.
Subtle mods that just smarted it up without looking like it got crashed into Halfords!