I just found this thread also so I guess I'll chime in too.
I have eaten a lot of CFS, all in the name of research you understand, and have narrowed it down to two that are different but good in their own way.
Goodsons Cafe in Tomball, Tx was named best CFS in Texas by Texas Country Reporter magazine. Theirs is as big as your plate with a thick, crispy crust fried as Alton would say GBD(golden brown and delicious). It is topped with white cream gravy with just the right amount of pepper. Yellow gravy I associate with chicken gravy and not acceptable.
The second is Mary's Cafe in Stawn, Tx just west of DFW off I20. Hers is also as big as your plate. The difference is that her crust is thin just a little thicker than its German counterpart so you can taste the meat better. It comes with a cereal sized bowl of cream gravy on the side. The negative and the reason it is no.2 in my book is they do not have mashed potatoes on the menu, it comes with french fries or it would tie with Goodsons.
On I20 around the corner from Marys is Thurber, Tx. and home of the Smokestack Restaurant. They claim to have the best CFS on I20. I have had it and it is good but they put something in the crust, I think it is onion or garlic powder, I have'nt quit put my finger on it yet, which gives it an off taste.
The real place for the best CFS in Texas no longer exists. It was The Cottonwood Inn in La Grange, Texas. Halfway between Austin and Houston it was a favorite eating stop for travelers, politicians and students on their way back and forth from the state capital. Also a stop for those working up an appetite at Miss Monas, who by the way looked nothing like Dolly Parton.
Well those are my picks, FWIW.