Here's a candidate for $550 at 6th Avenue Electronics
I bought the 32HL66 from them in October and am still as happy as a clam at high tide. I paid $100 more then but, hey, that's what this hobby is all about. The longer you wait, the cheaper the goods become.
http://www.6ave.com/shop/searchresults.aspx?kwd=LCD&mnm=Toshiba&cti=&prc=&x=38&y=4
FWIW, the one I bought has a tuner built in. Many don't. The first one for $550 doesn't, I believe.
If you're planning to go with cable, satellite, or something else that requires a set top box, then a tuner isn't needed. If you want to get free OTA analog or digital/HD TV , they are a must.
If I might be so bold, may I suggest you go for the 32" 32HL66. Not only is it in/near your budget, that extra few inches will be appreciated big time AND it's good for 1080i.