Hi End Store In Austin Tx

Going to visit Austin in the near future. Any hi end stores I should check out?

Thank you
Whetstone Audio
Audio Systems

I found this tool very useful;
I'd second the first two posts. Whetstone carries a lot of UK gear: Naim, Rega, etc. Audio Systems has Martin Logan, Magnepan, Dali, Rega, Dynaudio and a bunch of other brands I can't remember right now. There are also a few "boutique" shops that do business by appt. only.