I was going to say the 39, but the 52 works for me as well since it's essentially a long-slide 39 (in a different caliber, of course). You guys have already posted great pictures of both of those fine guns.
I don't personally care for the squared off trigger guard on the 639, but personal preference is just that. Personal. I also prefer the curved backstrap of the 39 and its descendants over the straight one on the 59 or the 1911 series. To me it looks more elegant that way. Again, just personal preference.