I know your question is about 9mm, and I'm a Glock 19 owner and fan, but that new Springfield Arms XDm .45 is pretty tempting. If you stay in the Glock family, though, you'd be immediately familiar with the system.
I'm assuming you're asking about larger-size, right, and not into the pocket 9 range? That would be a totally different question.
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face