You will love Austin!
I have lived here since 1983 and have never regretted moving here.
There are tons of great neighborhoods in Austin in all directions. South West, South, The North West part of Austin up towards Great Hills and further is very nice. There are a million and fifty high-rise condos going up downtown which would work well for a 6th & Congress job location.
I have lived in Round Rock since 1998 (except for when I moved for a couple of years to Asheville, NC 2000-2003) It is just North of Austin. Kind of a northern suburb.
It is OK but it is not the same place that it was when I left to move to Asheville. Way north is Georgetown which is where I think I might buy my house at.
Well anyway, you will never be bored here. There is music, festivals, outdoor stuff, small towns, Great People!
Good luck in your move and let us know how it goes!