I always thought Mueller would have been a good place. It's probably a long-shot, but I think a top notch soccer stadium for the Aztex, as well as other soccer matches would be sweet built as a focal point in an urban section of Mueller. Imagine VMU surrounding the stadium with ground-floor restaurants and pubs. Streetcar/Lightrail for easy access from other parts of town. I know I'm dreaming, but that would be awesome!
There was a story in the Austin Chronicle about the possibility of Highland Mall being a location when it's redeveloped.
http://www.austinchronicle.com/gyrob...oid=oid:790023
Then there's a link to an organization dedicated to getting a soccer-specific stadium built in Central Austin.
http://www.austinstadium.org/
This is an example of the size of stadium they're proposing. This one seats 13,500. Just for comparison's sake, U.T.'s football stadium seats nearly 100,000.
http://en.wikipedia.org/wiki/Skagerak_Arena