Austin is not SV, but rents there have jumped in the last decade. Try pricing out a 2br apt, near one of the major tech offices. First place I clicked on was $2,300 a month! Average is closer to $1,500. This is unusual for Texas =)
300k is definitely highly unusual for Austin. With that salary you can literally live like a King. Buy a house in the city AND one on Lake Travis for the weekends.
