I bought the car with std brakes then buy the big brake kit. You will also need to buy different rear pads. You have brand new front callipers, disks and rear pads to sell.
I would not go with Caterhams QR column, I'd go with the Rapfix version with a Caterham column then get the Momo of your choice. The Rapfix does not start to wobble after 100 miles, are a lot easier to get on and off. Again you have the std Mountney wheel and column to sell after IVA.
You want a LSD but I'd only want a Titan and I'm not sure what CC are selling at the mo.
Weather kit, sell the silly roof (CC gave me £200 credit for mine) buy a half hood.
Trackday roll bar. The std one isn't worth it's scrap value so no point in getting the TD one from the parts desk.
Personally I would have the carbon dash but that just for bling and I like bling
If you only listen to one thing then let it be this, buy the "R" !!! You will not regret it and it will save you money in the long run.
Jason