I've recently picked up a Brooks B17 Special for my bicycle, and while the saddle looks wonderful, its short rails leave me without enough room to push it back, at least on my regular-setback (looks like maybe 1.5cm) FSA seatpost.

Which 27.2mm seatpost should I go for, then? Specifically, does anyone know definitively which of these seatposts offer the most setback?

• Kalloy Uno 374
• Truvativ Team Single Clamp
• Velo Orange Grand Cru

Thanks in advance for your help, folks.

Jacob