The only reason I went for Philips is cos I used to work for Sony and everyone then reckoned along with Samsung they were the best for LCD. not 100% about plasma.
What I do know is that Sony are moving all their customer services and technical support to an agency so if you want advice on anything you're not going to get very good aftersales service from them. Your best bet would be to be from a well versed and knowledgable retailer who can give you an unbiased opinion.
for me, it would be Samsung or Philips. Its true the Sony Bravia range are good but over priced. I'm not sure about now, but Fujitsu used to make Sony LCD and Plasma units. Thats was a couple of years ago now. May have changed.
so, to sum up IMO, its Samsung, Philips, or Sony if you can get a good deal on one, and you don't need to call them directly ever