I would go with the Sony because it has a great picture and it's bigger. 52" to 60" is a pretty large jump and I think having a larger picture adds a lot to the enjoyment. Of course you don't say what your distance is, or if you need a flat panel (I don't). Someone else mentioned the new Mits DLP units which are also worth considering (again not flat but up to 73".)
Best bang for the buck - Sony KDS-60A3000. Lists at $2200 - 60" and should be viewed before you purchase anything. It rivals and surpasses a number of LCDs and plasmas in picture quality at 1/2 to 1/3 the price. One of the best-kept secrets in video that I recently got turned onto.
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