Castellano Designs Fango SS
With traction and control exceeding that of any HT but less weight and complexity than any FS I felt that the Fango would make a great singlespeed
   

 
180mm ENO cranks and a Paul Melvin tensioner
Fox F100X fork - No mushyness, no lockout fiddlyness
No room for a larger tire, so a wider rim maximizes both volume and stiffness
 
 
Jeff Jones curved H-bars
 
Drive-side chainstay is thinner to make room for chainrings
Tight clearances on both sides of the chainstay
Bolt-on Phil Wood hub to maximize lateral stiffness
ExiWolf 2.1 is about as tall as it takes