If I was going with any metal frame, it would be a CZ. I have time with a CZ 75BD, and I love the ergonomics and ease of accuracy. The first mag I put through it, I felt like I'd been shooting it for years. It melted into my hand, pointed intuitively, and shot PoA.
Currently Own: Beretta PX4 9mm, Glock 23 (Gen 4), Glock 19 (Gen 4) x2