Hello and welcome to MINI2
Choosing between the Clubman and the hatch is a personal one - If you need the extra space or just prefer the individuality of the Clubman, then go for that - Or if you just prefer having a 2+2 and something that's a little smaller, then the hatch would suit. However, I can't dictate what you want, that would be communism - Your car, your choice - Do what you think is right - Either way, they are both great cars
On colour, again that's a personal choice - There's a fairly large spectrum on both cars, always something to choose from
Bonnet or Viper Stripes? That's a split opinion - Many would say one, many would say the other, however, I prefer bonnet stripes - Personal opinion, I love Viper stripes, just not for me at the
mo JCW kit (assuming its the engine package?) is only available on the Cooper S and Cooper Clubman S, and again, you'd need to drive both to see what you'd like - Some people report of huge differences, some report hardly any change at all.
If you mean the aero kit, then again it's personal opinion - Get two cars side by side and see what you think - Whether it be on a forecourt or on the web
Xenons - A resound yes - They are expensive, however they cannot be retro-fitted and add to re-sale value as the standard lights are like candles flower pots - ie next to useless. There is a cheaper solution however - You can change the standard Halogen bulb for a more powerful bulb - I think another forum member KenL has done this, and IIRC, he was pleased with the result.
Best of luck with whatever you choose,
Ollie