Doing the heatgun trick is really only a temporary fix. There's a good chance that your PS3 will YLOD again. I know some people say they've never had a problem after doing it once, but do you really want to take the chance? The majority of them have said they had to keep on doing it over and over again. And even then, there's a good chance that one day the 'fix' might not work anymore.
The best suggestion would be to do a heatgun fix, then get another PS3 and use the Data Transfer Utility. With the heatgun fix, you never know when it might happen again.