I do not know any scenario where the attacker can purchase one recon dr ( E 1.23 ). Despite the fact this simple rule was never used as SSR of a ordinary scenario (at least as far as I know ) this could be an intersting option purchased by the attacker at the cost of another item in his OB or simply sacrificing an HS before the setup.
If the defender has at the same time the option to decide/purchase partially his OB, then an intriguing game of feints and counter feints begins before tha game actually starts.
I like the concept, but....
I think only allowing it for one side, is too powerful, and too cheap..at a HS.
I am not sure how you could offer to a defender where the attacker enters all his force or nearly so,..... but allowing the attacker to gain recon like this of the defender is I think titling things too far to the attacker (esp. in small scale think SP type scenarios). Sure you could claim their dr would yield just 1 hex and this at a cost of a HS is not a good trade (I admit), but if they score 4+ then well that is jack pot gold to an attacker.
Also I think you have to put some kind of 'depth' of search concept in. The players shouldn't be able to select some hex 10 hexes deep in the OPFORs zone, but rather only say within 4-5 hexes of the 'front line' (could be defined as some hex row or hex grain or numbered hexes < 4 for example). After all, to my mind, the Recon represents probes by one's own forces which do not penetrate deep behind the lines (these arn't LRRPs) and is a different for of Recon that Prisoner Interrogation (where you might well glean info about things 10 hexes deep) or Civilian Interrogation (where likewise such info could be gleaned.
MY comments are not meant to poo-pooh the concept which I like, rather only that apply it needs to be done with care and consideration that is all.
Also the 'cost' could be weighted for example if the record dr is 1-2, there is no cost to the user, if the dr is 3-4 the cost is HS if the dr is 5-6 the cost is a squad. The Reconning player can always opt if he rolls well (dr 5-6) to say I will only claim it was a dr 2 (and thus recon only 2 hexes and pay nothing) or he could say I will claim the dr was only a 3 and pay a HS.
Anyways just thoughts.