I am currently doing the same thing only last week a got my stuff to detail my car, just waiting for the decent weather.
ave already got the rnse in my car but ano wot you mean ave seen how much they are too but as an other option ave seen an after market one made by "witson" which seems to be brilliant according to the reviews, and they are only in the region £289 so maybe that could be an option for you, there is something ave been looking at today and that was getting spacers for alloys to give my car a wider stance but undecided about it,
Cheers for the extra ideas tho plenty to think about now haha, am still undecided on the rear lights tho as both the smoked and red look mint on them pics above!!!