Anecdotal evidence aside... I think the Elites have been the initial beneficiary of the improved heatsink and other engineering fixes that are being performed on the returned RRoD consoles (as well as showing up on the HDMI Premiums, which apparently use the Elite Mobos, from what I've read)...
Having said that, I think with proper _good_ airflow, and the new heatsink, the Elites are less likely to have the RRoD issue crop up as the consoles without said heatsink. Nothing's impossible, and since the 360 is what it is, we might see the issue crop up from time to time, but for the most part, I think it should be passed... Microsoft wouldn't have spent 1.5 billion bucks giving everyone the free RRoD fix (for an affected console) if they didn't have something that would keep them from coming back time after time (pure speculation on my part...)
With Microsoft's silence (preventing an inevitable recall), we'll never know for sure... but since they're in this to beat Sony and Nintendo, I think they're not going to take future RRoD design flaws lightly...
For every person who's had 3 console repair cycles (or more) there is another who chimes in that their launch system works great, and they've been playing next to Grandma's blast furnace since day one... Take everyone's anecdotal evidence as a snippet of the bigger picture... and I think that if you do, whatever your decision... it will be correct for you. (Unless you decide to buy an Edsel....)
