Road bike recommendations

Framesets < £2K, aero and svelte. I can see:

• giant propel (advanced pro?);
  
• scott foil;
  
• felt ar1;
  
• merida reacto; and
  
• argon 18 nitrogen.
  
  

I've left out specialized as they are (even more so than the above) boring.

Then for a little bit more there's the S3.

Anyone else been through this process and have some advice to give?