Yeah I think it looks good with the 15" alloys, sometimes big wheels on a small car look overkill.
I think the idea of practicing on another set of plastics is a good. I quite like your front lights, they look alright. I like them on white clio's aswell, the design is simpler and more 'euro' some how.
The fogs will look good but to be honest I've used them once in the whole time I've owned the car and that was when visability was about 10 meters in thick fog.
You could just get the plastic surrounds and put a couple of cold air feeds in instead of the lamps.
There is a pair of leather 1*2 front seats (dark grey) going on ebay at the mo for a reasonable price.