My least expensive is a Feg PA-63. Lately, I've carried a near pristine S&W M1917 a few times but that'll end when I hang up my coat for the warm weather or get over the joy that comes from actually owning one. By then, it'll be sweltering and I'll be back with the P3AT in my pocket. I usually go with what works and the Feg and the P3AT will do the job.
I must admit that it is a kinda cool feeling, though, having a .45 ACP N-frame on hand. It is one heavy sucker.