I have had an XDm 9mm for quite a while and looked around quite a bit for something smaller to carry. I ended deciding I wanted a similar feel/layout to my Xdm so I did not have to worry about different safeties, trigger feel, etc. between my pistols. So ended up getting an XDm Compact 9mm. Conceals OK IWB, the short grip really helps. Would have liked a little thinner but love the capacity and the fact that the feel/layout is near identical to my XDm other than the grip length.
And the day I bought that the XDs was announced, grrrr. XDs is only in .45 now but rumors are that .40 and 9mm will not be far behind. If you can wait a while you might want to delay until you can check out one of those. http://www.tngunowners.com/forums/handguns/67874-new-xds.html