I started my real estate Wordpress website about 6 months ago. I was skeptical about the subdomain of my IDX provider, but i couldn't find a better fit. I have 100's of hours into to my site now and it is doing well (thank you Moz.com!), but I am noticing that my main domain authority is higher than my subdomain authority. I am now having doubts about my IDX provider and am looking into ways to host a RETS feed on my server. I don't think there is any better way for Real Estate SEO. Unfortunately, I have not found an easy way to do this that works with my MLS. My site is greatcoloradohomes.com, if you would like to check it out. I am open to any constructive criticism to help me with it.
Like I said, I have hundreds of personal hours (many late nights) invested in this topic. If i can provide any helpful advice, I'd be glad to help. I always enjoy talking about real estate websites and the options available. This topic has a lot of evolving to do over the next few years.