The integrated BluRay was a big part of the decision. It was the 'other' thing I was looking to buy at the time and I got both for the combined price and only had to talk my wife into one purchase instead of two. It also played SACDs back then, which was something else I had an urge to experiment with.
The premature Xbox deaths were also at their worst around that time but it was the BR and SACD that really moved it to the PS3 for me. For gaming, I had no preference back then, as long as it played Rock Band.
With great power comes Awesome irresponsibility.