I can speak from experience when I say that Austin's entrepreneurial community is welcoming, supportive, and full of very sharp folks. You should definitely check out the Lean Startup group (http://www.meetup.com/Austin-Lean-Startup-Circle/). Our next meetup is a joint holiday mixer with a lot of other Austin groups (like Austin on Rails), and it promises to be a great way to meet a ton of folks.
Also, I'm not sure if you're looking for a workspace with a lot of people in the same position, but we've really benefited from participation in the Austin Technology Incubator.
How big is the Austin startup community? Austin seems like a hell of a lot nicer place to live than the Bay Area, but I'm afraid I'd miss the incredible magnitude of the support available to startups here.
I can vouch for getting together with Louis. He and I have done coffee a couple of times now, and he's got a great perspective on everything from funding to really in-depth technical issues.
Congratulations, good luck, and reach out often and always if you need a nudge or support. Full disclosure: I've been in the same boat and have been threatening to jump. If you're open to it, I'd love to exchange a few emails.
ps, wasn't there a new incubator recently announced in Austin?
Another SF-based startup here - I would love to know as well. We usually work out of my apartment (don't tell my landlord!) but getting a change of scenery from time to time would be nice.
If you're in SF, let me know
We have a sweet co-working space for hackers with all of the three C's: coffee, camaraderie, and a fast connection