We just stayed at the Omni Austin Hotel Downtown. Had booked a standard room, however a few days before arriving they emailed an offer for an upgrade to a suite for (what I deemed) a reasonable price so we took it. No complaints about the hotel. Staff were great, suites had only been refreshed a few weeks earlier, not sure what the other rooms are like.
As a Plat PC member the rest of our trip we stayed in IHG hotels, and this one was at least as good as any others we stayed in. We looked at IHG in Austin but they all got pretty poor reviews. Not sure if we got a good deal, however when we looked at Omni for other cities they seemed prohibitively more expensive, however for our dates in Austin they were great value.
In short, cant go wrong with Omni if it suits your price range.