Why a Diana Model 5? They are comparable with many other recoilling pistols, going that direction you will eventually get back to the Webley Junior & the GAT! There is no comparison! I don't mean this to read as cras as it will so apologies. (limited intelligence on part )
Do you mean the recoiless Diana Model 6 or 6m or even the Model 10 maybe?
Don't discount the SSP pistols from FWB, Pardini etc., all are very good & not too expensive if you shop around.