Of course you need another Sig
However, I think you are reaching the point in your pistol owning career that you need to take stock. Why not consider: a good quality 45 government model, saving up for a Sig P210, a Seecamp 32 or a top notch 22 target pistol like a FAS or a Hammerli. Or going against my bias for autos, a Davis or a Korth revolver.
In reality we don't really need all the guns we buy, but it's fun and if one can afford it, what's the problem? The otherside of the argument is the old adage, "beware the man with only one gun, he probably knows how to use it!" ie it's better to concentrate on learning to use one pistol really well. (shame I've never been able to follow this advice myself)