Last week i bought a....
95184 Krusell Leather Case Horizontic Plus (S-Wide) w/ Spring clip
Here is a link Krusell
I have plenty of room to have my 8100 with the seidio rubberized case inside... It is perfectly wide, but has room to breathe. The lifetime warranty doesn't hurt either. This case has a double belt clip system. The first is you can use the snap on multitap clip or you can use the leather straps that connect in the back and snap on the bottom. I use the snap so i can easily take it off my belt and put it on, it is very very secure.
I highly recommend it. I got it for a little over 20 bucks online.
Let me know if you have questions.