Custom Stainless Road Bike

Just as a thought experiment, if Jake gave you this suggested list of frames+prices, which one would you go for?

• 853 disc braked road bike, tapered steerer, Di2 only, £1,500 (frame)
  
• 921 disc braked road bike, tapered steerer, Di2 only, £1,800 (frame)
  
• 931 disc braked road bike, tapered steerer, Di2 only, £1,900 (frame)
  
• 953 disc braked road bike, tapered steerer, Di2 only, £2,500 (frame)