I have an obscure 5943 (DAO, Alloy Frame) but I would go with the 5906 as being THE gun to have. To me having 5 or 6 'most iconic' guns would be a step in the right direction.
Why, O Why are these guns being obsoleted? I have a bunch of semi's but I'd trade them all in for third gens of different configurations starting with the 5906 then the 3916.
Geeeeeee. That's nice to think about.
