I've used several around Austin.
Miller's has very good sausage, and I usually bring one to them. I prefer their summer sausage over all the others I've tried.
As already said, Hudson's makes an excellent chopped steak. My whole family loves them. I like their Italian sausage and brats too.
Johnny G's in South Austin makes really good dry sausage, but you have to get a bunch (I think their minimum sausage order is 25#).
The Buck Stops Here is where I used to go. I think the Hudson's Guy bought them, and supposedly brought the same recipes, but their chopped steak wasn't as good when I tried them after the sale. Good smoked sausage though.
Closer to you, I've heard Green's sausage house in Temple is reallly goo, but I haven't tried them.
This year I'm doing my own for everything, which I've really enjoyed so far.