OP linked to a 2 bolt zero set back seat post, there are others that both bolts
are behind the post itself.

like that, Tulio Campagnolo's 2 bolt seatposts are 50 year old designs.

or this one, recent design: 27.2 with 26mm of setback
http://www.universalcycles.com/shopp...0&category=167

A 30.2mm setback
http://www.universalcycles.com/shopp...&category=4309

Many More .. if frame takes other than 27.2 seat post , choices are reduced..

Where Kalloy is better, pragmatically, a full range of diameters are made,
and for B&M shops they dont cost much, unsold, to stock. if you want something else Ask,
both of the above are distributed by QBP, most shops have an account with them.