I am shooting an XDm 5.25, and at first I was using the XD holster and mag pouches, but have recently made some upgrades.
A good belt is money well spent, I am using the CR Speed 2 piece belt, really like it, nice to know all your gear is in the same spot each time.
I got two of the double pouches Jean posted a link to (thought I got a good deal at $15 shipped each on ebay....) For the money I think they work great, all I have done with them is cut the paddle so they can fit side by side and they dont really need the "paddle" with them mounted on the stiff CR Speed belt.
I just upgraded to the Blade Tech DOH holster, getting use to the different mounting position of it, I have an issue with my thumb jamming into when gripping the gun fast, dont recall having that issue with my other holsters.
If you are handy with tools I would say get the PRP Ultimate Trigger Kit, I installed this myself (world of difference), just take your time and follow the youtube video, pretty straight forward, the most time consuming part for me filing the trigger for the over travel stop. At the same time I installed the .100 extended mag release.
For me the front sight blade was too thick, could not see enough day light around it in the post, so I had a thinner Dawson front sight installed, but have not been able to get out and shoot it yet.
I installed the PRP rubber grip stickers, a friend had the grip type style, and was a little to agressive for my taste right now.