I'm not a big fan of revolvers. However, I did buy my mom a S&W 642 chambered in .38 special. It's a nice revolver, both lightweight and simple to use.
The XDM looks like a nice gun, but I'd for sure want to shoot it first before buying.
Although my next purchase will be a Kimber, I don't think anything beats a Glock. I've shot probably 2000+ rounds out of my Glock 26 and never had any problems. The material that glocks are made of seems to repel burnt powder. My friend never cleans his Glock 19 and shoots it more than I do mine, and he has never had a malfunction.