Seems a bit pricey as has already been said but if you are after an Airsporter try and source one privately rather than from a dealer who will always add a significant price mark-up.
Again, as has also been said, a mk1 or mk 2 with open sights and visible etching on air chamber is what I would go for but if your eyesight is not so good and you require a scope then you will need to go for a later mark with means of fitting a scope.