Sorry to bump this for an update...Over the weekend, my Safari was quiting on me after about every two pages loads, at first I had music playing...then I turned it off and was having the same problem. I normally leave it on standby and never really turn it off, but decided to take a page out of MS troubleshooting and turned it COMPLETELY off and back on and like magic I was able to play music and surf with 5 open pages without out 1 quit the rest of the day (about 4 hours).
Not the #1 ideal solution, but reboot takes <1min so it'll work for me for now.
UPDATE: I had about 500mb freespace.