I'd rather take the hit with Sir Chesney, blooding him like us with Krul than with Given, a keeper destroyed by injury and not playing. They need a keeper about to hit his prime, 27-29, established and not just a good shot stopper, someone with presence in the box, a good communicator and spot on distribution, none of which Given ever had even at the height of his powers.
True that, as much as I loved Shay when he was with us (now that he's left, wish nowt but failure for him), he did lack the attributes you highlighted. But I reckon he can still do a job for Arsenal, in the short term anyway.
EDIT: but then again, Szeczney playing for a full season will do him a lot of good and aid his development.