It's up to you buddy, it's YOUR car. What do you think would look good?
I would say V1 rear spoiler on a standard car. I have seen the sides on a standard car and it looked good but it's personal taste.
You can always put rear mud flaps on if you don't like the spats as that looks very good.
The 70 quid side skirts, are they genuine or not? I'd watch what you are buying as there are some really bad replicas out there, by the time the bodyshop has modified them to fit you'd have been cheaper getting genuine ones!