I've got my 925 in the Wireless Charging Shell (in red), paired with a Skinomi Techskin screen protector. So far, the charging shell adds only a slight bit more girth - it's not nearly as noticeable in daily use compared to what I've read online. It also adds a tiny bit of a ridge to the side of the phone, eliminating the "bar of soap" feeling that the naked aluminum exudes. Given this, it makes the phone far less prone to dropping... which covers the whole point of a protective cover in the first place! :wink:
The Skinomi TechSkin protector... It's the only screen protector that I've found that flows cleanly over the curved side of the glass, without rippling up. The whole debate on screen protector vs. naked glass was already covered in the Nokia Icon article from a few days ago - bottom line, if you live in an area that has silicate dust/debris (sand!) in the air, like the southwest US, the Gorilla Glass screen will get fine, noticeable scratches on the screen. Those drive me nuts; the TechSkin self-heals to an extent and the fine scratches go away. When it gets scratched to the point of being noticeable, I replace the skin and go about my business - not so easy to do the glass itself. It's a little sacrifice, since the TPU doesn't feel as nice as the glass, but the glass will last just that much longer.
To carry the phone, I just use a generic leather side-holster/pouch that I used with my Nexus 4 - the Nexus is a slight bit bigger than the 925, but with the charging Shell attached, it fits nicely.