Well, the 580 seems to be the newest model considering I havent seen it before. But doesnt really look any different the the a550 except 35k dynamic contrast instead of 30k. But for the 2 sets you choose, I would recommend the Sony V4100. I researched both tv's for awhile and after comparing side by side, the Sony's picture just looks a little more natural and most dynamic contrast numbers are bs anyways. But you really can't go wrong with either one. One thing to consider is buying one of these tv's on Amazon.com.
One thing to consider is buying one of these tv's on Amazon.com. You could get the a550 52 inch for only $1700 or for the price range that you were showing, you could order the a650 which has a better picture then both the a550 and the v4100. Also, the 120hz works killer on this set. It's $2300 with free shipping. Here is a link to both the A550 and A650.
http://www.amazon.com/Samsung-LN52A550-52-Inch-1080p-HDTV/dp/B001415EMI/ref=pd_bbs_sr_2?ie=UTF8&s=electronics&qid=1217805716&sr=8-2
http://www.amazon.com/Samsung-LN52A650-52-Inch-1080p-120Hz/dp/B001413DF8/ref=pd_bbs_sr_1?ie=UTF8&s=electronics&qid=1217805716&sr=8-1
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