Well, the department I used to work for required it's full time deputies to furnish their own gear(very small department with a very small budget to match). It sucked, but on the plus side, there were no limitations on what you could purchase.
Most of us chose nylon, and Gall's was what I purchased. Don't let the price fool you, that stuff is a really good deal. It lasted a lot longer than I have. In fact, I found out not too long ago that the reserve I sold it to after I moved over to the 911 center still has most of it and still uses it.
The biggest suggestion I could make for you is this: Dont buy the Monandnock expandable pr-24 if you're worried about comfort. It'll have to be removed everytime you get in the car, and if you've got to do that might as well carry a standard one. I'd go with ASP for your baton. YMMV, but mine was extremely uncomfortable while sitting, and the rotating holder for it stuck out almost as far as a jacket slot holster, which made trying to move through tight areas a pain.